1 files changed, 1 insertions, 1 deletions
diff --git a/examples/widgets/animation/sub-attaq/mainwindow.h b/examples/widgets/animation/sub-attaq/mainwindow.h
index 8d3cc85cd1..c4fb9d324d 100644
--- a/examples/widgets/animation/sub-attaq/mainwindow.h
+++ b/examples/widgets/animation/sub-attaq/mainwindow.h
@@ -62,7 +62,7 @@ class MainWindow : public QMainWindow
 {
 Q_OBJECT
 public:
-    MainWindow();
+    MainWindow(QWidget *parent = nullptr);
 
 private:
     GraphicsScene *scene;