diff --git a/examples/opengl/hellowindow/hellowindow.cpp b/examples/opengl/hellowindow/hellowindow.cpp
index 235775f09a..048190d766 100644
--- a/examples/opengl/hellowindow/hellowindow.cpp
+++ b/examples/opengl/hellowindow/hellowindow.cpp
@@ -93,6 +93,8 @@ HelloWindow::HelloWindow(const QSharedPointer<Renderer> &renderer, QScreen *scre
 void HelloWindow::exposeEvent(QExposeEvent *)
 {
     m_renderer->setAnimating(this, isExposed());
+    if (isExposed())
+        m_renderer->render();
 }
 
 void HelloWindow::mousePressEvent(QMouseEvent *)
diff --git a/examples/opengl/hellowindow/hellowindow.h b/examples/opengl/hellowindow/hellowindow.h
index 1372152e93..e92e45a125 100644
--- a/examples/opengl/hellowindow/hellowindow.h
+++ b/examples/opengl/hellowindow/hellowindow.h
@@ -70,7 +70,7 @@ public:
 
     void setAnimating(HelloWindow *window, bool animating);
 
-private slots:
+public slots:
     void render();
 
 private: