1 files changed, 1 insertions, 6 deletions
diff --git a/examples/widgets/graphicsview/padnavigator/padnavigator.h b/examples/widgets/graphicsview/padnavigator/padnavigator.h
index 00cf2c0212..0fe9ad045d 100644
--- a/examples/widgets/graphicsview/padnavigator/padnavigator.h
+++ b/examples/widgets/graphicsview/padnavigator/padnavigator.h
@@ -54,17 +54,12 @@
 #include <QGraphicsView>
 #include "ui_form.h"
 
-QT_BEGIN_NAMESPACE
-class QState;
-class QStateMachine;
-QT_END_NAMESPACE
-
 //! [0]
 class PadNavigator : public QGraphicsView
 {
     Q_OBJECT
 public:
-    explicit PadNavigator(const QSize &size, QWidget *parent = 0);
+    explicit PadNavigator(const QSize &size, QWidget *parent = nullptr);
 
 protected:
     void resizeEvent(QResizeEvent *event) override;