diff --git a/debug-viewer/GstDebugViewer/Common/GUI.py b/debug-viewer/GstDebugViewer/Common/GUI.py
index 2f9049d309..131eb222ab 100644
--- a/debug-viewer/GstDebugViewer/Common/GUI.py
+++ b/debug-viewer/GstDebugViewer/Common/GUI.py
@@ -40,7 +40,7 @@ def widget_add_popup_menu (widget, menu, button = 3):
     def popup_callback (widget, event):
 
         if event.button == button:
-            menu.popup (None, None, None, event.button, event.get_time ())
+            menu.popup (None, None, None, None, event.button, event.get_time ())
         return False
 
     widget.connect ("button-press-event", popup_callback)