diff --git a/examples/opengl/hellogles3/glwindow.h b/examples/opengl/hellogles3/glwindow.h
index fe5d5383e98..8b7758d1b07 100644
--- a/examples/opengl/hellogles3/glwindow.h
+++ b/examples/opengl/hellogles3/glwindow.h
@@ -46,11 +46,15 @@
 #include <QVector3D>
 #include "../hellogl2/logo.h"
 
+QT_BEGIN_NAMESPACE
+
 class QOpenGLTexture;
 class QOpenGLShaderProgram;
 class QOpenGLBuffer;
 class QOpenGLVertexArrayObject;
 
+QT_END_NAMESPACE
+
 class GLWindow : public QOpenGLWindow
 {
     Q_OBJECT