diff --git a/language/duchain/navigation/useswidget.h b/language/duchain/navigation/useswidget.h
--- a/language/duchain/navigation/useswidget.h
+++ b/language/duchain/navigation/useswidget.h
@@ -72,7 +72,7 @@
         explicit NavigatableWidgetList(bool allowScrolling = false, uint maxHeight = 0, bool vertical = true);
         ~NavigatableWidgetList() override;
         void addItem(QWidget* widget, int pos = -1);
-        void addHeaderItem(QWidget* widget, Qt::Alignment alignment = nullptr);
+        void addHeaderItem(QWidget* widget, Qt::Alignment alignment = {});
         ///Whether items were added to this list using addItem(..)
         bool hasItems() const;
         ///Deletes all items that were added using addItem
diff --git a/shell/documentcontroller.cpp b/shell/documentcontroller.cpp
--- a/shell/documentcontroller.cpp
+++ b/shell/documentcontroller.cpp
@@ -211,7 +211,7 @@
 
     IDocument* openDocumentInternal( const QUrl & inputUrl, const QString& prefName = QString(),
         const KTextEditor::Range& range = KTextEditor::Range::invalid(), const QString& encoding = QString(),
-        DocumentController::DocumentActivationParams activationParams = nullptr,
+        DocumentController::DocumentActivationParams activationParams = {},
         IDocument* buddy = nullptr)
     {
         Q_ASSERT(!inputUrl.isRelative());
diff --git a/shell/watcheddocumentset.cpp b/shell/watcheddocumentset.cpp
--- a/shell/watcheddocumentset.cpp
+++ b/shell/watcheddocumentset.cpp
@@ -95,22 +95,22 @@
             emit m_documentSet->changed();
     }
 
-    void setDocuments(const DocumentSet& docs, ActionFlags flags = nullptr)
+    void setDocuments(const DocumentSet& docs, ActionFlags flags = {})
     {
         m_documents = docs;
         doUpdate(flags);
     }
 
-    void addDocument(const IndexedString& doc, ActionFlags flags = nullptr)
+    void addDocument(const IndexedString& doc, ActionFlags flags = {})
     {
         if (m_documents.contains(doc))
             return;
 
         m_documents.insert(doc);
         doUpdate(flags);
     }
 
-    void delDocument(const IndexedString& doc, ActionFlags flags = nullptr)
+    void delDocument(const IndexedString& doc, ActionFlags flags = {})
     {
         if (!m_documents.contains(doc))
             return;
diff --git a/util/multilevellistview.h b/util/multilevellistview.h
--- a/util/multilevellistview.h
+++ b/util/multilevellistview.h
@@ -52,7 +52,7 @@
      * @param parent parent widget
      * @param f window flags, passed to QWidget
      */
-    explicit MultiLevelListView(QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
+    explicit MultiLevelListView(QWidget* parent = nullptr, Qt::WindowFlags f = {});
     /**
      * Default destructor
      */
diff --git a/vcs/widgets/standardvcslocationwidget.h b/vcs/widgets/standardvcslocationwidget.h
--- a/vcs/widgets/standardvcslocationwidget.h
+++ b/vcs/widgets/standardvcslocationwidget.h
@@ -33,7 +33,7 @@
 {
     Q_OBJECT
     public:
-        explicit StandardVcsLocationWidget(QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
+        explicit StandardVcsLocationWidget(QWidget* parent = nullptr, Qt::WindowFlags f = {});
         VcsLocation location() const override;
         bool isCorrect() const override;
         QUrl url() const;
diff --git a/vcs/widgets/vcslocationwidget.h b/vcs/widgets/vcslocationwidget.h
--- a/vcs/widgets/vcslocationwidget.h
+++ b/vcs/widgets/vcslocationwidget.h
@@ -38,7 +38,7 @@
 {
     Q_OBJECT
     public:
-        explicit VcsLocationWidget(QWidget* parent = nullptr, Qt::WindowFlags f = nullptr);
+        explicit VcsLocationWidget(QWidget* parent = nullptr, Qt::WindowFlags f = {});
         
         /** @returns the VcsLocation specified in the widget. */
         virtual VcsLocation location() const=0;