diff --git a/src/plugins/platforms/cocoa/qcocoatheme.h b/src/plugins/platforms/cocoa/qcocoatheme.h
index 5ec0b30786..31340c7781 100644
--- a/src/plugins/platforms/cocoa/qcocoatheme.h
+++ b/src/plugins/platforms/cocoa/qcocoatheme.h
@@ -77,7 +77,7 @@ private:
     mutable QPalette *m_systemPalette;
     mutable QHash<QPlatformTheme::Palette, QPalette*> m_palettes;
     mutable QHash<QPlatformTheme::Font, QFont*> m_fonts;
-    mutable QCocoaThemeNotificationReceiver *m_notificationReceiver;
+    mutable QT_MANGLE_NAMESPACE(QCocoaThemeNotificationReceiver) *m_notificationReceiver;
 };
 
 QT_END_NAMESPACE