diff --git a/examples/opengl/cube/mainwidget.h b/examples/opengl/cube/mainwidget.h
index c6da29faa59..eb509d0d40e 100644
--- a/examples/opengl/cube/mainwidget.h
+++ b/examples/opengl/cube/mainwidget.h
@@ -48,8 +48,10 @@
 #include <QQuaternion>
 #include <QVector2D>
 
+QT_BEGIN_NAMESPACE
 class QBasicTimer;
 class QGLShaderProgram;
+QT_END_NAMESPACE
 
 class GeometryEngine;
 
diff --git a/examples/widgets/orientation/mainwindow.h b/examples/widgets/orientation/mainwindow.h
index 400a6a5a7f7..45907c31beb 100644
--- a/examples/widgets/orientation/mainwindow.h
+++ b/examples/widgets/orientation/mainwindow.h
@@ -46,7 +46,9 @@
 #include "ui_landscape.h"
 #include "ui_portrait.h"
 
+QT_BEGIN_NAMESPACE
 class QAbstractButton;
+QT_END_NAMESPACE
 
 //! [0]
 class MainWindow : public QWidget