diff --git a/examples/DrawIntoPainter/framewidget.h b/examples/DrawIntoPainter/framewidget.h
--- a/examples/DrawIntoPainter/framewidget.h
+++ b/examples/DrawIntoPainter/framewidget.h
@@ -32,7 +32,7 @@
     Q_OBJECT
 
 public:
-    explicit FrameWidget( QWidget * parent = 0, Qt::WindowFlags f = 0 );
+    explicit FrameWidget( QWidget * parent = 0, Qt::WindowFlags f = Qt::WindowFlags() );
 
     void paintEvent( QPaintEvent* ) Q_DECL_OVERRIDE;
 
diff --git a/examples/Gantt/legend_example/entrydialog.h b/examples/Gantt/legend_example/entrydialog.h
--- a/examples/Gantt/legend_example/entrydialog.h
+++ b/examples/Gantt/legend_example/entrydialog.h
@@ -39,7 +39,7 @@
     Q_OBJECT
 
 public:
-    explicit EntryDialog( const QAbstractItemModel* model, QWidget* parent = 0, Qt::WindowFlags f = 0 );
+    explicit EntryDialog( const QAbstractItemModel* model, QWidget* parent = 0, Qt::WindowFlags f = Qt::WindowFlags() );
     void initFrom( const QModelIndex& index, const KGantt::ConstraintModel* constraintModel );
     
     QString name() const;
diff --git a/examples/Gantt/legend_example/mainwindow.h b/examples/Gantt/legend_example/mainwindow.h
--- a/examples/Gantt/legend_example/mainwindow.h
+++ b/examples/Gantt/legend_example/mainwindow.h
@@ -41,7 +41,7 @@
     Q_OBJECT
 
 public:
-    explicit MainWindow( QWidget * parent = 0, Qt::WindowFlags flags = 0 );
+    explicit MainWindow( QWidget * parent = 0, Qt::WindowFlags flags = Qt::WindowFlags() );
     virtual ~MainWindow();
     void closeEvent(QCloseEvent *event) Q_DECL_OVERRIDE;
 
diff --git a/qtests/DrawIntoPainter/framewidget.h b/qtests/DrawIntoPainter/framewidget.h
--- a/qtests/DrawIntoPainter/framewidget.h
+++ b/qtests/DrawIntoPainter/framewidget.h
@@ -32,7 +32,7 @@
     Q_OBJECT
 
 public:
-    explicit FrameWidget( QWidget * parent = 0, Qt::WindowFlags f = 0 );
+    explicit FrameWidget( QWidget * parent = 0, Qt::WindowFlags f = Qt::WindowFlags() );
 
     void paintEvent( QPaintEvent* ) Q_DECL_OVERRIDE;
 
diff --git a/src/KChart/KChartChart.cpp b/src/KChart/KChartChart.cpp
--- a/src/KChart/KChartChart.cpp
+++ b/src/KChart/KChartChart.cpp
@@ -151,7 +151,7 @@
 class MyWidgetItem : public QWidgetItem
 {
 public:
-    explicit MyWidgetItem(QWidget *w, Qt::Alignment alignment = 0)
+    explicit MyWidgetItem(QWidget *w, Qt::Alignment alignment = Qt::Alignment())
         : QWidgetItem( w )
     {
         setAlignment( alignment );
@@ -868,7 +868,7 @@
              * column of the shared grid. */
             planeLayoutItems << plane;
             plane->setParentLayout( planeLayout );
-            planeLayout->addItem( plane, row, column, 1, 1, 0 );
+            planeLayout->addItem( plane, row, column, 1, 1 );
             //qDebug() << "Chart slotLayoutPlanes() calls planeLayout->addItem("<< row << column << ")";
             planeLayout->setRowStretch( row, 2 );
             planeLayout->setColumnStretch( column, 2 );
diff --git a/src/KChart/KChartLayoutItems.h b/src/KChart/KChartLayoutItems.h
--- a/src/KChart/KChartLayoutItems.h
+++ b/src/KChart/KChartLayoutItems.h
@@ -49,7 +49,7 @@
     class KCHART_EXPORT AbstractLayoutItem : public QLayoutItem
     {
     public:
-        AbstractLayoutItem( Qt::Alignment itemAlignment = 0 ) :
+        AbstractLayoutItem( Qt::Alignment itemAlignment = Qt::Alignment() ) :
             QLayoutItem( itemAlignment ),
             mParent( 0 ),
             mParentLayout( 0 ) {}
@@ -102,7 +102,7 @@
                         const TextAttributes& attributes,
                         const QObject* autoReferenceArea,
                         KChartEnums::MeasureOrientation autoReferenceOrientation,
-                        Qt::Alignment alignment = 0 );
+                        Qt::Alignment alignment = Qt::Alignment() );
 
         void setAutoReferenceArea( const QObject* area );
         const QObject* autoReferenceArea() const;
@@ -173,7 +173,7 @@
                               const TextAttributes& attributes,
                               const QObject* autoReferenceArea,
                               KChartEnums::MeasureOrientation autoReferenceOrientation,
-                              Qt::Alignment alignment = 0 );
+                              Qt::Alignment alignment = Qt::Alignment() );
 
         ~TextBubbleLayoutItem();
 
@@ -221,7 +221,7 @@
                               const MarkerAttributes& marker,
                               const QBrush& brush,
                               const QPen& pen,
-                              Qt::Alignment alignment = 0 );
+                              Qt::Alignment alignment = Qt::Alignment() );
 
             Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
             QRect geometry() const Q_DECL_OVERRIDE;
@@ -260,7 +260,7 @@
                             int length,
                             const QPen& pen,
                             Qt::Alignment mLegendLineSymbolAlignment,
-                            Qt::Alignment alignment = 0 );
+                            Qt::Alignment alignment = Qt::Alignment() );
 
             Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
             QRect geometry() const Q_DECL_OVERRIDE;
@@ -303,7 +303,7 @@
                                       const MarkerAttributes& marker,
                                       const QBrush& markerBrush,
                                       const QPen& markerPen,
-                                      Qt::Alignment alignment = 0 );
+                                      Qt::Alignment alignment = Qt::Alignment() );
 
             Qt::Orientations expandingDirections() const Q_DECL_OVERRIDE;
             QRect geometry() const Q_DECL_OVERRIDE;
diff --git a/src/KChart/KChartLayoutItems.cpp b/src/KChart/KChartLayoutItems.cpp
--- a/src/KChart/KChartLayoutItems.cpp
+++ b/src/KChart/KChartLayoutItems.cpp
@@ -293,7 +293,7 @@
 
 Qt::Orientations KChart::TextLayoutItem::expandingDirections() const
 {
-    return 0; // Grow neither vertically nor horizontally
+    return Qt::Orientations(); // Grow neither vertically nor horizontally
 }
 
 QRect KChart::TextLayoutItem::geometry() const
@@ -637,7 +637,7 @@
 
 Qt::Orientations KChart::MarkerLayoutItem::expandingDirections() const
 {
-    return 0; // Grow neither vertically nor horizontally
+    return Qt::Orientations(); // Grow neither vertically nor horizontally
 }
 
 QRect KChart::MarkerLayoutItem::geometry() const
@@ -732,7 +732,7 @@
 
 Qt::Orientations KChart::LineLayoutItem::expandingDirections() const
 {
-    return 0; // Grow neither vertically nor horizontally
+    return Qt::Orientations(); // Grow neither vertically nor horizontally
 }
 
 QRect KChart::LineLayoutItem::geometry() const
@@ -831,7 +831,7 @@
 
 Qt::Orientations KChart::LineWithMarkerLayoutItem::expandingDirections() const
 {
-    return 0; // Grow neither vertically nor horizontally
+    return Qt::Orientations(); // Grow neither vertically nor horizontally
 }
 
 QRect KChart::LineWithMarkerLayoutItem::geometry() const
@@ -891,7 +891,7 @@
 
 Qt::Orientations KChart::AutoSpacerLayoutItem::expandingDirections() const
 {
-    return 0; // Grow neither vertically nor horizontally
+    return Qt::Orientations(); // Grow neither vertically nor horizontally
 }
 
 QRect KChart::AutoSpacerLayoutItem::geometry() const
diff --git a/tests/Gantt/apireview/entrydialog.h b/tests/Gantt/apireview/entrydialog.h
--- a/tests/Gantt/apireview/entrydialog.h
+++ b/tests/Gantt/apireview/entrydialog.h
@@ -39,7 +39,7 @@
     Q_OBJECT
 
 public:
-    EntryDialog( const QAbstractItemModel* model, QWidget* parent = 0, Qt::WindowFlags f = 0 );
+    EntryDialog( const QAbstractItemModel* model, QWidget* parent = 0, Qt::WindowFlags f = Qt::WindowFlags() );
     void initFrom( const QModelIndex& index, const KGantt::ConstraintModel* constraintModel );
     
     QString name() const;
diff --git a/tests/Gantt/apireview/mainwindow.h b/tests/Gantt/apireview/mainwindow.h
--- a/tests/Gantt/apireview/mainwindow.h
+++ b/tests/Gantt/apireview/mainwindow.h
@@ -40,7 +40,7 @@
     Q_OBJECT
 
 public:
-    MainWindow( QWidget * parent = 0, Qt::WindowFlags flags = 0 );
+    MainWindow( QWidget * parent = 0, Qt::WindowFlags flags = Qt::WindowFlags() );
 
 private slots:
     void addNewEntry();