diff --git a/libs/canvas/canvas.cc b/libs/canvas/canvas.cc
index 8fc816341b..fe42fd4b07 100644
--- a/libs/canvas/canvas.cc
+++ b/libs/canvas/canvas.cc
@@ -326,7 +326,7 @@ GtkCanvas::GtkCanvas ()
 {
 	/* these are the events we want to know about */
 	add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK |
-		    Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK);
+		    Gdk::SCROLL_MASK | Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK);
 }
 
 void