diff --git a/gtk2_ardour/group_tabs.cc b/gtk2_ardour/group_tabs.cc
index 6c3ce31d8e..0e429e562a 100644
--- a/gtk2_ardour/group_tabs.cc
+++ b/gtk2_ardour/group_tabs.cc
@@ -504,7 +504,7 @@ GroupTabs::collect (RouteGroup* g)
 		++j;
 	}
 
-	sync_order_keys ();
+	_session->sync_order_keys ();
 }
 
 void