diff --git a/backgroundselector.h b/backgroundselector.h
index bbf997efe0bef8e14b2310771d55e0202f44ba4c..1c2463fd1f0c913de2f2ef1daf340c4d3f39ac06 100644
--- a/backgroundselector.h
+++ b/backgroundselector.h
@@ -40,7 +40,7 @@ class BackgroundSelector : public QWidget {
         void useRandomBackgroundPicturesChanged(bool state);
         void previewBackgroundPicture();
     protected:
-        void changeEvent(QEvent *e);
+        void changeEvent(QEvent *e) Q_DECL_OVERRIDE;
         void enableSettings(bool enable=true);
     private:
         Ui::KBounceBackgroundSelector *ui;
diff --git a/board.h b/board.h
index 0a0a439ca90ff3f61d2ca656e11ebb83bead550d..b387c69b8aa54ba6c9a20b8442f2c6ec1249e007 100644
--- a/board.h
+++ b/board.h
@@ -47,7 +47,7 @@ class KBounceBoard: public QGraphicsObject
 
         QPixmap applyWallsOn(QPixmap background) const;
         void resize( QSize& size );
-        void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) {}
+        void paint(QPainter *, const QStyleOptionGraphicsItem *, QWidget *) Q_DECL_OVERRIDE {}
 
         void newLevel( int level );
         void setPaused( bool );
@@ -62,7 +62,7 @@ class KBounceBoard: public QGraphicsObject
         void checkCollisions();
 
         QPoint mapPosition( const QPointF& pos ) const;
-        QRectF boundingRect() const;
+        QRectF boundingRect() const Q_DECL_OVERRIDE;
 
         void setBallVelocity(qreal velocity);
         void setWallVelocity(qreal velocity);
diff --git a/gamewidget.h b/gamewidget.h
index a03f464507cc32a7a4ea483ebfc552963ad6db86..8ff6867ee4d3689623c9c80d5a00c4ece9be2a25 100644
--- a/gamewidget.h
+++ b/gamewidget.h
@@ -48,7 +48,7 @@ class KBounceGameWidget : public QGraphicsView
         KBounceGameWidget::State state() const { return m_state; }
         KBounceRenderer* renderer() { return &m_renderer; }
 
-        QSize minimumSizeHint() const;
+        QSize minimumSizeHint() const Q_DECL_OVERRIDE;
 
     public slots:
         void closeGame();
@@ -74,9 +74,9 @@ class KBounceGameWidget : public QGraphicsView
         void tick();
 
     protected:
-        virtual void resizeEvent( QResizeEvent* event );
-        virtual void mouseReleaseEvent( QMouseEvent* event );
-        void focusOutEvent(QFocusEvent *event);
+        void resizeEvent( QResizeEvent* event ) Q_DECL_OVERRIDE;
+        void mouseReleaseEvent( QMouseEvent* event ) Q_DECL_OVERRIDE;
+        void focusOutEvent(QFocusEvent *event) Q_DECL_OVERRIDE;
         void closeLevel();
         void newLevel();
         void updateCursor();
diff --git a/mainwindow.h b/mainwindow.h
index 33e389271bd0aae0119f53c61a237c68a3629da5..24f020034afab816fd71adbd9b04aa216b971031 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -58,8 +58,8 @@ class KBounceMainWindow : public KXmlGuiWindow
         void initXMLUI();
         void highscore();
 
-        void focusOutEvent( QFocusEvent * );
-        void focusInEvent ( QFocusEvent * );
+        void focusOutEvent( QFocusEvent * ) Q_DECL_OVERRIDE;
+        void focusInEvent ( QFocusEvent * ) Q_DECL_OVERRIDE;
 
         KBounceGameWidget* m_gameWidget;