diff --git a/src/plugins/qt4projectmanager/qt4runconfiguration.h b/src/plugins/qt4projectmanager/qt4runconfiguration.h
index ce1d44769e0..0913fc0861c 100644
--- a/src/plugins/qt4projectmanager/qt4runconfiguration.h
+++ b/src/plugins/qt4projectmanager/qt4runconfiguration.h
@@ -38,9 +38,11 @@
 #include <QtCore/QStringList>
 #include <QtGui/QWidget>
 
+QT_BEGIN_NAMESPACE
 class QWidget;
 class QLabel;
 class QLineEdit;
+QT_END_NAMESPACE
 
 namespace Qt4ProjectManager {