diff --git a/src/gui/AbstractMainTaskWindow.hpp b/src/gui/AbstractMainTaskWindow.hpp
index 9c71b50bf0ad899e5d9f6c3920b27a925c3c3bf0..e242e94c124828afb0fb8128334c58e0da129d8a 100644
--- a/src/gui/AbstractMainTaskWindow.hpp
+++ b/src/gui/AbstractMainTaskWindow.hpp
@@ -55,6 +55,7 @@ namespace massxpert
 
   class AbstractMainTaskWindow : public QMainWindow
   {
+    Q_OBJECT
     protected:
     ProgramWindow *mp_parentWnd;