diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -125,6 +125,10 @@
     add_definitions(-DHAVE_POSIX_ACL)
 endif(ACL_HEADERS_FOUND AND ACL_LIBS AND ATTR_LIBS)
 
+if (CMAKE_COMPILER_IS_GNUCXX)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wsuggest-override" CACHE STRING "" FORCE)
+endif()
+
 #include(ConfigureChecks.cmake)
 
 add_subdirectory(krusader)
diff --git a/krArc/krarc.h b/krArc/krarc.h
--- a/krArc/krarc.h
+++ b/krArc/krarc.h
@@ -63,7 +63,7 @@
 protected:
     virtual bool   initDirDict(const QUrl &url, bool forced = false);
     virtual bool   initArcParameters();
-    void checkIf7zIsEncrypted(bool &, QString);
+    void checkIf7zIsEncrypted(bool &, QString) Q_DECL_OVERRIDE;
     virtual void parseLine(int lineNo, QString line);
     virtual bool setArcFile(const QUrl &url);
     virtual QString getPassword();
diff --git a/krArc/krarc.cpp b/krArc/krarc.cpp
--- a/krArc/krarc.cpp
+++ b/krArc/krarc.cpp
@@ -73,21 +73,21 @@
         KrArcCodec(QTextCodec * codec) : originalCodec(codec) {}
         virtual ~KrArcCodec() {}
 
-        virtual QByteArray name() const {
+        virtual QByteArray name() const Q_DECL_OVERRIDE {
             return  originalCodec->name();
         }
-        virtual QList<QByteArray> aliases() const {
+        virtual QList<QByteArray> aliases() const Q_DECL_OVERRIDE {
             return originalCodec->aliases();
         }
-        virtual int mibEnum() const {
+        virtual int mibEnum() const Q_DECL_OVERRIDE {
             return  originalCodec->mibEnum();
         }
 
     protected:
-        virtual QString convertToUnicode(const char *in, int length, ConverterState *state) const {
+        virtual QString convertToUnicode(const char *in, int length, ConverterState *state) const Q_DECL_OVERRIDE {
             return originalCodec->toUnicode(in, length, state);
         }
-        virtual QByteArray convertFromUnicode(const QChar *in, int length, ConverterState *state) const {
+        virtual QByteArray convertFromUnicode(const QChar *in, int length, ConverterState *state) const Q_DECL_OVERRIDE {
             // the QByteArray is embedded into the unicode charset (QProcess hell)
             QByteArray result;
             for (int i = 0; i != length; i++) {
diff --git a/krusader/ActionMan/addplaceholderpopup.h b/krusader/ActionMan/addplaceholderpopup.h
--- a/krusader/ActionMan/addplaceholderpopup.h
+++ b/krusader/ActionMan/addplaceholderpopup.h
@@ -116,10 +116,10 @@
 {
 public:
     ParameterText(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KLineEdit * _lineEdit;
     QString _preset;
@@ -134,10 +134,10 @@
     Q_OBJECT
 public:
     ParameterPlaceholder(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KLineEdit * _lineEdit;
     QToolButton* _button;
@@ -153,10 +153,10 @@
 {
 public:
     ParameterYes(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     QCheckBox* _checkBox;
 };
@@ -169,10 +169,10 @@
 {
 public:
     ParameterNo(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     QCheckBox* _checkBox;
 };
@@ -186,10 +186,10 @@
     Q_OBJECT
 public:
     ParameterFile(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KLineEdit * _lineEdit;
     QToolButton* _button;
@@ -205,10 +205,10 @@
 {
 public:
     ParameterChoose(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KComboBox * _combobox;
 };
@@ -221,10 +221,10 @@
 {
 public:
     ParameterSelect(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KComboBox * _combobox;
 };
@@ -238,10 +238,10 @@
     Q_OBJECT
 public:
     ParameterGoto(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KLineEdit * _lineEdit;
     QToolButton* _dirButton, *_placeholderButton;
@@ -258,10 +258,10 @@
 {
 public:
     ParameterSyncprofile(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KComboBox * _combobox;
 };
@@ -274,10 +274,10 @@
 {
 public:
     ParameterPanelprofile(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KComboBox * _combobox;
 };
@@ -290,10 +290,10 @@
 {
 public:
     ParameterSearch(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     KComboBox * _combobox;
 };
@@ -306,10 +306,10 @@
 {
 public:
     ParameterInt(const exp_parameter& parameter, QWidget* parent);
-    QString text();
-    QString preset();
-    void reset();
-    bool valid();
+    QString text() Q_DECL_OVERRIDE;
+    QString preset() Q_DECL_OVERRIDE;
+    void reset() Q_DECL_OVERRIDE;
+    bool valid() Q_DECL_OVERRIDE;
 private:
     QSpinBox * _spinbox;
     int _default;
diff --git a/krusader/Archive/krarchandler.h b/krusader/Archive/krarchandler.h
--- a/krusader/Archive/krarchandler.h
+++ b/krusader/Archive/krarchandler.h
@@ -74,7 +74,7 @@
     // queries the password from the user
     static QString getPassword(QString path);
     // detects the archive type
-    void checkIf7zIsEncrypted(bool &, QString);
+    void checkIf7zIsEncrypted(bool &, QString) Q_DECL_OVERRIDE;
 private:
     //! checks if a returned status ("exit code") of an archiving-related process is OK
     static bool checkStatus(QString type, int exitCode);
diff --git a/krusader/BookMan/krbookmarkhandler.h b/krusader/BookMan/krbookmarkhandler.h
--- a/krusader/BookMan/krbookmarkhandler.h
+++ b/krusader/BookMan/krbookmarkhandler.h
@@ -64,7 +64,7 @@
     void clearBookmarks(KrBookmark *root, bool removeBookmarks = true);
     void buildMenu(KrBookmark *parent, QMenu *menu, int depth = 0);
 
-    bool eventFilter(QObject *obj, QEvent *ev);
+    bool eventFilter(QObject *obj, QEvent *ev) Q_DECL_OVERRIDE;
     void rightClicked(QMenu *menu, KrBookmark *bm);
     void rightClickOnSpecialBookmark();
 
diff --git a/krusader/Dialogs/krspecialwidgets.h b/krusader/Dialogs/krspecialwidgets.h
--- a/krusader/Dialogs/krspecialwidgets.h
+++ b/krusader/Dialogs/krspecialwidgets.h
@@ -46,7 +46,7 @@
     void addSlice(KIO::filesize_t size, QString label);
 
 protected:
-    void paintEvent(QPaintEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 private:
     QList<KRPieSlice> slices;
@@ -88,7 +88,7 @@
     }
 
 protected:
-    void paintEvent(QPaintEvent *);
+    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
 
 private:
     KIO::filesize_t totalSpace, freeSpace;
diff --git a/krusader/Dialogs/krspwidgets.h b/krusader/Dialogs/krspwidgets.h
--- a/krusader/Dialogs/krspwidgets.h
+++ b/krusader/Dialogs/krspwidgets.h
@@ -56,8 +56,8 @@
     newFTPSub();
 
 protected:
-    void reject();
-    void accept();
+    void reject() Q_DECL_OVERRIDE;
+    void accept() Q_DECL_OVERRIDE;
 };
 
 /////////////////////////// KRMaskChoiceSub /////////////////////////////////
@@ -69,15 +69,15 @@
     explicit KRMaskChoiceSub(QWidget * parent = 0);
 
 public slots:
-    void addSelection();
-    void deleteSelection();
-    void clearSelections();
-    void acceptFromList(QListWidgetItem *i);
-    void currentItemChanged(QListWidgetItem *i);
+    void addSelection() Q_DECL_OVERRIDE;
+    void deleteSelection() Q_DECL_OVERRIDE;
+    void clearSelections() Q_DECL_OVERRIDE;
+    void acceptFromList(QListWidgetItem *i) Q_DECL_OVERRIDE;
+    void currentItemChanged(QListWidgetItem *i) Q_DECL_OVERRIDE;
 
 protected:
-    void reject();
-    void accept();
+    void reject() Q_DECL_OVERRIDE;
+    void accept() Q_DECL_OVERRIDE;
 };
 
 #endif
diff --git a/krusader/Dialogs/krsqueezedtextlabel.h b/krusader/Dialogs/krsqueezedtextlabel.h
--- a/krusader/Dialogs/krsqueezedtextlabel.h
+++ b/krusader/Dialogs/krsqueezedtextlabel.h
@@ -54,7 +54,7 @@
     void clicked(QMouseEvent *); /**< emitted when someone clicks on the label */
 
 protected:
-    void resizeEvent(QResizeEvent *) {
+    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE {
         squeezeTextToLabel(_index, _length);
     }
     virtual void mousePressEvent(QMouseEvent *e) Q_DECL_OVERRIDE;
diff --git a/krusader/Dialogs/newftpgui.h b/krusader/Dialogs/newftpgui.h
--- a/krusader/Dialogs/newftpgui.h
+++ b/krusader/Dialogs/newftpgui.h
@@ -50,7 +50,7 @@
     KLineEdit* password;
 
 protected:
-    bool event(QEvent *);
+    bool event(QEvent *) Q_DECL_OVERRIDE;
 
 private slots:
     void slotTextChanged(const QString &);
diff --git a/krusader/Dialogs/packgui.h b/krusader/Dialogs/packgui.h
--- a/krusader/Dialogs/packgui.h
+++ b/krusader/Dialogs/packgui.h
@@ -31,11 +31,11 @@
     PackGUI(QString defaultName, QString defaultPath, int noOfFiles, QString filename = "");
 
 public slots:
-    void browse();
+    void browse() Q_DECL_OVERRIDE;
 
 protected slots:
-    void accept();
-    void reject();
+    void accept() Q_DECL_OVERRIDE;
+    void reject() Q_DECL_OVERRIDE;
 
 public:
     static QString filename, destination, type;
diff --git a/krusader/DiskUsage/filelightParts/fileTree.h b/krusader/DiskUsage/filelightParts/fileTree.h
--- a/krusader/DiskUsage/filelightParts/fileTree.h
+++ b/krusader/DiskUsage/filelightParts/fileTree.h
@@ -338,7 +338,7 @@
     }
 
     virtual ~Directory() {}
-    virtual bool            isDir()               const  {
+    virtual bool isDir() const Q_DECL_OVERRIDE {
         return true;
     }
 
diff --git a/krusader/FileSystem/defaultfilesystem.h b/krusader/FileSystem/defaultfilesystem.h
--- a/krusader/FileSystem/defaultfilesystem.h
+++ b/krusader/FileSystem/defaultfilesystem.h
@@ -61,7 +61,7 @@
     QUrl getUrl(const QString &name) const Q_DECL_OVERRIDE;
     bool canMoveToTrash(const QStringList &) const Q_DECL_OVERRIDE { return isLocal(); }
 
-    QString mountPoint() const { return _mountPoint; }
+    QString mountPoint() const Q_DECL_OVERRIDE { return _mountPoint; }
     bool hasAutoUpdate() const Q_DECL_OVERRIDE { return !_watcher.isNull(); }
     void updateFilesystemInfo() Q_DECL_OVERRIDE;
 
diff --git a/krusader/FileSystem/filesystem.h b/krusader/FileSystem/filesystem.h
--- a/krusader/FileSystem/filesystem.h
+++ b/krusader/FileSystem/filesystem.h
@@ -67,9 +67,9 @@
     virtual ~FileSystem();
 
     // DirListerInterface implementation
-    inline QList<FileItem *> fileItems() const { return _fileItems.values(); }
-    inline unsigned long numFileItems() const { return _fileItems.count(); }
-    inline bool isRoot() const {
+    inline QList<FileItem *> fileItems() const Q_DECL_OVERRIDE { return _fileItems.values(); }
+    inline unsigned long numFileItems() const Q_DECL_OVERRIDE { return _fileItems.count(); }
+    inline bool isRoot() const Q_DECL_OVERRIDE {
         const QString path = _currentDirectory.path();
         return path.isEmpty() || path == "/";
     }
diff --git a/krusader/GUI/kcmdline.h b/krusader/GUI/kcmdline.h
--- a/krusader/GUI/kcmdline.h
+++ b/krusader/GUI/kcmdline.h
@@ -79,14 +79,14 @@
     void setCurrent(const QString &path);
     //virtual methods from KrActionBase
     void setText(QString text);
-    QString command() const;
-    ExecType execType() const;
-    QString startpath() const;
-    QString user() const;
-    QString text() const;
-    bool acceptURLs() const;
-    bool confirmExecution() const;
-    bool doSubstitution() const;
+    QString command() const Q_DECL_OVERRIDE;
+    ExecType execType() const Q_DECL_OVERRIDE;
+    QString startpath() const Q_DECL_OVERRIDE;
+    QString user() const Q_DECL_OVERRIDE;
+    QString text() const Q_DECL_OVERRIDE;
+    bool acceptURLs() const Q_DECL_OVERRIDE;
+    bool confirmExecution() const Q_DECL_OVERRIDE;
+    bool doSubstitution() const Q_DECL_OVERRIDE;
 
 signals:
     void signalRun();
diff --git a/krusader/GUI/mediabutton.h b/krusader/GUI/mediabutton.h
--- a/krusader/GUI/mediabutton.h
+++ b/krusader/GUI/mediabutton.h
@@ -61,7 +61,7 @@
     void aboutToShow();
 
 protected:
-    bool eventFilter(QObject *o, QEvent *e);
+    bool eventFilter(QObject *o, QEvent *e) Q_DECL_OVERRIDE;
     bool getNameAndIcon(Solid::Device &, QString &, QIcon &);
 
 private:
diff --git a/krusader/KViewer/lister.cpp b/krusader/KViewer/lister.cpp
--- a/krusader/KViewer/lister.cpp
+++ b/krusader/KViewer/lister.cpp
@@ -1182,15 +1182,15 @@
     }
 
 protected:
-    virtual QString currentCharacterSet() {
+    virtual QString currentCharacterSet() Q_DECL_OVERRIDE {
         return _lister->characterSet();
     }
 
-    virtual void chooseDefault() {
+    virtual void chooseDefault() Q_DECL_OVERRIDE {
         _lister->setCharacterSet(QString());
     }
 
-    virtual void chooseEncoding(QString encodingName) {
+    virtual void chooseEncoding(QString encodingName) Q_DECL_OVERRIDE {
         QString charset = KCharsets::charsets()->encodingForName(encodingName);
         _lister->setCharacterSet(charset);
     }
diff --git a/krusader/KViewer/panelviewer.h b/krusader/KViewer/panelviewer.h
--- a/krusader/KViewer/panelviewer.h
+++ b/krusader/KViewer/panelviewer.h
@@ -93,19 +93,19 @@
 {
     Q_OBJECT
 public slots:
-    virtual bool closeUrl();
+    virtual bool closeUrl() Q_DECL_OVERRIDE;
 
 public:
     explicit PanelViewer(QWidget *parent, KrViewer::Mode mode = KrViewer::Default);
     ~PanelViewer();
 
-    virtual bool isEditor() {
+    virtual bool isEditor() Q_DECL_OVERRIDE {
         return false;
     }
 
 protected:
-    virtual void openFile(KFileItem fi);
-    virtual KParts::ReadOnlyPart* createPart(QString mimetype);
+    virtual void openFile(KFileItem fi) Q_DECL_OVERRIDE;
+    virtual KParts::ReadOnlyPart* createPart(QString mimetype) Q_DECL_OVERRIDE;
     KParts::ReadOnlyPart* getDefaultPart(KFileItem fi);
     KParts::ReadOnlyPart* getHexPart();
     KParts::ReadOnlyPart* getListerPart(bool hexMode = false);
@@ -116,24 +116,24 @@
 {
     Q_OBJECT
 public:
-    virtual bool isModified();
-    virtual bool isEditor() {
+    virtual bool isModified() Q_DECL_OVERRIDE;
+    virtual bool isEditor() Q_DECL_OVERRIDE {
         return true;
     }
 
     static void configureDeps();
 
 public slots:
-    virtual bool closeUrl();
-    virtual bool queryClose();
+    virtual bool closeUrl() Q_DECL_OVERRIDE;
+    virtual bool queryClose() Q_DECL_OVERRIDE;
 
 public:
     explicit PanelEditor(QWidget *parent, KrViewer::Mode mode = KrViewer::Default);
     ~PanelEditor();
 
 protected:
-    virtual void openFile(KFileItem fi);
-    virtual KParts::ReadOnlyPart* createPart(QString mimetype);
+    virtual void openFile(KFileItem fi) Q_DECL_OVERRIDE;
+    virtual KParts::ReadOnlyPart* createPart(QString mimetype) Q_DECL_OVERRIDE;
     static QString missingKPartMsg();
 };
 
diff --git a/krusader/Konfigurator/konfiguratoritems.h b/krusader/Konfigurator/konfiguratoritems.h
--- a/krusader/Konfigurator/konfiguratoritems.h
+++ b/krusader/Konfigurator/konfiguratoritems.h
@@ -121,8 +121,8 @@
     void slotSetDefaults(QObject *);
 
 protected:
-    virtual void checkStateSet();
-    virtual void nextCheckState();
+    virtual void checkStateSet() Q_DECL_OVERRIDE;
+    virtual void nextCheckState() Q_DECL_OVERRIDE;
     void updateDeps();
 
     bool  defaultValue;
diff --git a/krusader/Konfigurator/krresulttable.h b/krusader/Konfigurator/krresulttable.h
--- a/krusader/Konfigurator/krresulttable.h
+++ b/krusader/Konfigurator/krresulttable.h
@@ -88,7 +88,7 @@
     explicit KrArchiverResultTable(QWidget* parent);
     virtual ~KrArchiverResultTable();
 
-    bool addRow(SearchObject* search, QGridLayout* grid);
+    bool addRow(SearchObject* search, QGridLayout* grid) Q_DECL_OVERRIDE;
 
 protected:
     KUrlLabel* _nameLabel;
@@ -107,7 +107,7 @@
     explicit KrToolResultTable(QWidget* parent);
     virtual ~KrToolResultTable();
 
-    bool addRow(SearchObject* search, QGridLayout* grid);
+    bool addRow(SearchObject* search, QGridLayout* grid) Q_DECL_OVERRIDE;
 
 protected:
     QList<Application*> _apps;
diff --git a/krusader/Locate/locate.cpp b/krusader/Locate/locate.cpp
--- a/krusader/Locate/locate.cpp
+++ b/krusader/Locate/locate.cpp
@@ -84,7 +84,7 @@
         setAlternatingRowColors(true);
     }
 
-    void startDrag(Qt::DropActions supportedActs) {
+    void startDrag(Qt::DropActions supportedActs) Q_DECL_OVERRIDE {
         Q_UNUSED(supportedActs);
 
         QList<QUrl> urls;
diff --git a/krusader/Panel/krcalcspacedialog.h b/krusader/Panel/krcalcspacedialog.h
--- a/krusader/Panel/krcalcspacedialog.h
+++ b/krusader/Panel/krcalcspacedialog.h
@@ -39,8 +39,8 @@
      * to avoid a short appearance and is autoclosed when the calculation finished.
      */
     static void showDialog(QWidget *parent, SizeCalculator *calculator);
-    void closeEvent(QCloseEvent *);
-    void keyPressEvent(QKeyEvent *e);
+    void closeEvent(QCloseEvent *) Q_DECL_OVERRIDE;
+    void keyPressEvent(QKeyEvent *e) Q_DECL_OVERRIDE;
 
 private slots:
     void slotCancel(); // cancel was pressed
diff --git a/krusader/Search/krsearchdialog.h b/krusader/Search/krsearchdialog.h
--- a/krusader/Search/krsearchdialog.h
+++ b/krusader/Search/krsearchdialog.h
@@ -71,7 +71,7 @@
     virtual void resizeEvent(QResizeEvent *e) Q_DECL_OVERRIDE;
 
 protected slots:
-    void reject();
+    void reject() Q_DECL_OVERRIDE;
 
 private:
     bool gui2query();
diff --git a/krusader/Synchronizer/synchronizergui.h b/krusader/Synchronizer/synchronizergui.h
--- a/krusader/Synchronizer/synchronizergui.h
+++ b/krusader/Synchronizer/synchronizergui.h
@@ -150,7 +150,7 @@
     void saveToProfile(QString);
 
 protected slots:
-    void reject();
+    void reject() Q_DECL_OVERRIDE;
     void addFile(SynchronizerFileItem *);
     void markChanged(SynchronizerFileItem *, bool);
     void setScrolling(bool);
diff --git a/krusader/Synchronizer/synchronizergui.cpp b/krusader/Synchronizer/synchronizergui.cpp
--- a/krusader/Synchronizer/synchronizergui.cpp
+++ b/krusader/Synchronizer/synchronizergui.cpp
@@ -77,12 +77,12 @@
     SynchronizerListView(Synchronizer * sync, QWidget * parent) : KrTreeWidget(parent), synchronizer(sync) {
     }
 
-    void mouseMoveEvent(QMouseEvent * e) {
+    void mouseMoveEvent(QMouseEvent * e) Q_DECL_OVERRIDE {
         isLeft = ((e->modifiers() & Qt::ShiftModifier) == 0);
         KrTreeWidget::mouseMoveEvent(e);
     }
 
-    void startDrag(Qt::DropActions /* supportedActs */) {
+    void startDrag(Qt::DropActions /* supportedActs */) Q_DECL_OVERRIDE {
         QList<QUrl> urls;
 
         unsigned              ndx = 0;
diff --git a/krusader/Synchronizer/synchronizertask.h b/krusader/Synchronizer/synchronizertask.h
--- a/krusader/Synchronizer/synchronizertask.h
+++ b/krusader/Synchronizer/synchronizertask.h
@@ -126,7 +126,7 @@
     }
 
 protected slots:
-    virtual void start();
+    virtual void start() Q_DECL_OVERRIDE;
     void slotFinished(bool result);
     void slotOtherFinished(bool result);
 
@@ -160,7 +160,7 @@
     void    sendStatusMessage();
 
 protected:
-    virtual void start();
+    virtual void start() Q_DECL_OVERRIDE;
 
 protected slots:
     void    localFileCompareCycle();
diff --git a/krusader/UserAction/expander.cpp b/krusader/UserAction/expander.cpp
--- a/krusader/UserAction/expander.cpp
+++ b/krusader/UserAction/expander.cpp
@@ -114,24 +114,24 @@
 class exp_simpleplaceholder : public exp_placeholder
 {
 public:
-    EXP_FUNC;
+    EXP_FUNC Q_DECL_OVERRIDE;
     virtual TagString expFunc(const KrPanel*, const QStringList&, const bool&, Expander&) const = 0;
 };
 
 
 #define PLACEHOLDER_CLASS(name) \
     class name : public exp_placeholder { \
     public: \
         name(); \
-        virtual TagString expFunc ( const KrPanel*, const TagStringList&, const bool&, Expander& ) const; \
+        virtual TagString expFunc ( const KrPanel*, const TagStringList&, const bool&, Expander& ) const Q_DECL_OVERRIDE; \
     };
 
 #define SIMPLE_PLACEHOLDER_CLASS(name) \
     class name : public exp_simpleplaceholder { \
     public: \
         using exp_simpleplaceholder::expFunc; \
         name(); \
-        virtual TagString expFunc ( const KrPanel*, const QStringList&, const bool&, Expander& ) const; \
+        virtual TagString expFunc ( const KrPanel*, const QStringList&, const bool&, Expander& ) const Q_DECL_OVERRIDE; \
     };
 
 
diff --git a/krusader/UserAction/kraction.h b/krusader/UserAction/kraction.h
--- a/krusader/UserAction/kraction.h
+++ b/krusader/UserAction/kraction.h
@@ -77,42 +77,42 @@
         _category = category;
     };
 
-    QString command() const {
+    QString command() const Q_DECL_OVERRIDE {
         return _command;
     };
     void setCommand(const QString& command) {
         _command = command;
     };
 
-    QString user() const {
+    QString user() const Q_DECL_OVERRIDE {
         return _user;
     };
     void setUser(const QString& user) {
         _user = user;
     };
 
-    QString startpath() const {
+    QString startpath() const Q_DECL_OVERRIDE {
         return _startpath;
     };
     void setStartpath(const QString& startpath) {
         _startpath = startpath;
     };
 
-    ExecType execType() const {
+    ExecType execType() const Q_DECL_OVERRIDE {
         return _execType;
     };
     void setExecType(ExecType execType) {
         _execType = execType;
     };
 
-    bool acceptURLs() const {
+    bool acceptURLs() const Q_DECL_OVERRIDE {
         return _acceptURLs;
     };
     void setAcceptURLs(const bool& acceptURLs) {
         _acceptURLs = acceptURLs;
     };
 
-    bool confirmExecution() const {
+    bool confirmExecution() const Q_DECL_OVERRIDE {
         return _confirmExecution;
     };
     void setConfirmExecution(const bool& confirmExecution) {
@@ -147,11 +147,11 @@
         _showonlyFile = showonlyFile;
     };
 
-    bool doSubstitution() const {
+    bool doSubstitution() const Q_DECL_OVERRIDE {
         return true;
     }
 
-    QString text() const {
+    QString text() const Q_DECL_OVERRIDE {
         return QAction::text();
     }
 
diff --git a/krusader/krusader.h b/krusader/krusader.h
--- a/krusader/krusader.h
+++ b/krusader/krusader.h
@@ -82,10 +82,10 @@
         return this;
     }
     virtual KrView *activeView() Q_DECL_OVERRIDE;
-    ViewActions *viewActions() {
+    ViewActions *viewActions() Q_DECL_OVERRIDE {
         return _viewActions;
     }
-    virtual KActionCollection *actions() {
+    virtual KActionCollection *actions() Q_DECL_OVERRIDE {
         return actionCollection();
     }
     virtual AbstractPanelManager *activeManager() Q_DECL_OVERRIDE;