diff --git a/examples/opengl/hellowindow/hellowindow.cpp b/examples/opengl/hellowindow/hellowindow.cpp
index 489d715166c..380ddcc7021 100644
--- a/examples/opengl/hellowindow/hellowindow.cpp
+++ b/examples/opengl/hellowindow/hellowindow.cpp
@@ -72,16 +72,21 @@ HelloWindow::HelloWindow(Renderer *renderer)
 
     create();
 
-    QTimer *timer = new QTimer(this);
-    connect(timer, SIGNAL(timeout()), this, SLOT(render()));
-    timer->start(10);
-
     connect(this, SIGNAL(needRender(QSurface *, const QColor &, const QSize &)),
             renderer, SLOT(render(QSurface *, const QColor &, const QSize &)));
 
     updateColor();
 }
 
+void HelloWindow::exposeEvent(QExposeEvent *event)
+{
+    render();
+
+    QTimer *timer = new QTimer(this);
+    connect(timer, SIGNAL(timeout()), this, SLOT(render()));
+    timer->start(10);
+}
+
 void HelloWindow::mousePressEvent(QMouseEvent *)
 {
     updateColor();
diff --git a/examples/opengl/hellowindow/hellowindow.h b/examples/opengl/hellowindow/hellowindow.h
index 91267a8ba1a..8f294b5ae36 100644
--- a/examples/opengl/hellowindow/hellowindow.h
+++ b/examples/opengl/hellowindow/hellowindow.h
@@ -92,6 +92,8 @@ public:
 
     void updateColor();
 
+    void exposeEvent(QExposeEvent *event);
+
 signals:
     void needRender(QSurface *surface, const QColor &color, const QSize &viewSize);