diff --git a/xpra/gtk_common/gtk_util.py b/xpra/gtk_common/gtk_util.py
index 74e5789554..c1f56315f5 100644
--- a/xpra/gtk_common/gtk_util.py
+++ b/xpra/gtk_common/gtk_util.py
@@ -199,7 +199,7 @@ def get_default_cursor() -> Gdk.Cursor:
 em = Gdk.EventMask
 WINDOW_EVENT_MASK = em.STRUCTURE_MASK | em.KEY_PRESS_MASK | em.KEY_RELEASE_MASK \
         | em.POINTER_MOTION_MASK | em.BUTTON_PRESS_MASK | em.BUTTON_RELEASE_MASK \
-        | em.PROPERTY_CHANGE_MASK | em.SCROLL_MASK | em.SMOOTH_SCROLL_MASK
+        | em.PROPERTY_CHANGE_MASK | em.SCROLL_MASK
 if SMOOTH_SCROLL:
     WINDOW_EVENT_MASK |= em.SMOOTH_SCROLL_MASK