diff --git a/gtk2_ardour/editor_canvas.cc b/gtk2_ardour/editor_canvas.cc
index bf97bb73fc..3d763cbe56 100644
--- a/gtk2_ardour/editor_canvas.cc
+++ b/gtk2_ardour/editor_canvas.cc
@@ -583,6 +583,7 @@ Editor::autoscroll_canvas ()
 
 	VisualChange vc;
 	bool vertical_motion = false;
+	bool y_motion = false;
 
 	if (autoscroll_horizontal_allowed) {