diff --git a/xpra/client/gtk_base/gtk_client_window_base.py b/xpra/client/gtk_base/gtk_client_window_base.py
index b11fa83920..cea9c94684 100644
--- a/xpra/client/gtk_base/gtk_client_window_base.py
+++ b/xpra/client/gtk_base/gtk_client_window_base.py
@@ -36,7 +36,7 @@
     DEST_DEFAULT_MOTION, DEST_DEFAULT_HIGHLIGHT, ACTION_COPY,
     BUTTON_PRESS_MASK, BUTTON_RELEASE_MASK, POINTER_MOTION_MASK,
     POINTER_MOTION_HINT_MASK, ENTER_NOTIFY_MASK, LEAVE_NOTIFY_MASK,
-    WINDOW_EVENT_MASK,
+    WINDOW_EVENT_MASK, SMOOTH_SCROLL_MASK,
     )
 from xpra.gtk_common.keymap import KEY_TRANSLATIONS
 from xpra.client.client_window_base import ClientWindowBase
@@ -2121,6 +2121,10 @@ def get_mouse_event_wid(self, x, y):
     def _do_scroll_event(self, event):
         if self._client.readonly:
             return
+        if SMOOTH_SCROLL_MASK and event.direction==SMOOTH_SCROLL_MASK:
+            mouselog("smooth scroll event: %s", event)
+            self._client.wheel_event(self._id, event.delta_x, event.delta_y)
+            return
         button_mapping = GDK_SCROLL_MAP.get(event.direction, -1)
         mouselog("do_scroll_event device=%s, direction=%s, button_mapping=%s",
                  self._device_info(event), event.direction, button_mapping)
diff --git a/xpra/gtk_common/gtk_util.py b/xpra/gtk_common/gtk_util.py
index f02f4becef..2b877f0ae9 100644
--- a/xpra/gtk_common/gtk_util.py
+++ b/xpra/gtk_common/gtk_util.py
@@ -283,6 +283,7 @@ def pixbuf_new_from_data(*args):
     SUBSTRUCTURE_MASK    = gdk.EventMask.SUBSTRUCTURE_MASK
     STRUCTURE_MASK       = gdk.EventMask.STRUCTURE_MASK
     EXPOSURE_MASK        = gdk.EventMask.EXPOSURE_MASK
+    SMOOTH_SCROLL_MASK   = gdk.EventMask.SMOOTH_SCROLL_MASK
     ACCEL_LOCKED = gtk.AccelFlags.LOCKED
     ACCEL_VISIBLE = gtk.AccelFlags.VISIBLE
     JUSTIFY_LEFT    = gtk.Justification.LEFT
@@ -584,6 +585,7 @@ def cairo_set_source_pixbuf(cr, pixbuf, x, y):
     SUBSTRUCTURE_MASK    = gdk.SUBSTRUCTURE_MASK
     STRUCTURE_MASK       = gdk.STRUCTURE_MASK
     EXPOSURE_MASK        = gdk.EXPOSURE_MASK
+    SMOOTH_SCROLL_MASK   = 0
     ACCEL_LOCKED = gtk.ACCEL_LOCKED
     ACCEL_VISIBLE = gtk.ACCEL_VISIBLE
     JUSTIFY_LEFT    = gtk.JUSTIFY_LEFT