diff --git a/collects/mred/private/wx/gtk/canvas.rkt b/collects/mred/private/wx/gtk/canvas.rkt
index 5f73c315..05272527 100644
--- a/collects/mred/private/wx/gtk/canvas.rkt
+++ b/collects/mred/private/wx/gtk/canvas.rkt
@@ -391,8 +391,7 @@
                                                     GDK_KEY_RELEASE_MASK
                                                     GDK_BUTTON_PRESS_MASK
                                                     GDK_BUTTON_RELEASE_MASK
-                                                    GDK_POINTER_MOTION_HINT_MASK
-                                                    GDK_BUTTON_MOTION_MASK
+                                                    GDK_POINTER_MOTION_MASK
                                                     GDK_FOCUS_CHANGE_MASK
                                                     GDK_ENTER_NOTIFY_MASK
                                                     GDK_LEAVE_NOTIFY_MASK))