diff --git a/src/xpra/client/gtk_base/gtk_client_window_base.py b/src/xpra/client/gtk_base/gtk_client_window_base.py
index 6c2b53a058..efaa952843 100644
--- a/src/xpra/client/gtk_base/gtk_client_window_base.py
+++ b/src/xpra/client/gtk_base/gtk_client_window_base.py
@@ -357,7 +357,6 @@ def update_window_state(self, state_updates):
         if iconified is not None:
             statelog("iconified=%s", iconified)
             #handle iconification as map events:
-            assert not self._override_redirect
             if iconified:
                 #usually means it is unmapped
                 self._unfocus()