diff --git a/src/xpra/x11/gtk_x11/window.py b/src/xpra/x11/gtk_x11/window.py
index eebd2aa939..60c31fd254 100644
--- a/src/xpra/x11/gtk_x11/window.py
+++ b/src/xpra/x11/gtk_x11/window.py
@@ -937,7 +937,8 @@ class WindowModel(BaseWindowModel):
         "_NET_WM_ACTION_MAXIMIZE_HORZ",
         "_NET_WM_ACTION_MAXIMIZE_VERT",
         "_NET_WM_ACTION_CHANGE_DESKTOP",
-        #"_NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
+        "_NET_WM_ACTION_ABOVE",
+        "_NET_WM_ACTION_BELOW",
         ]
 
     __gproperties__ = {