diff --git a/gtk2_ardour/automation_region_view.cc b/gtk2_ardour/automation_region_view.cc
index ce1cd1498d..4a16177d29 100644
--- a/gtk2_ardour/automation_region_view.cc
+++ b/gtk2_ardour/automation_region_view.cc
@@ -137,6 +137,7 @@ AutomationRegionView::canvas_group_event (GdkEvent* ev)
 
 	if (trackview.editor().internal_editing() &&
 	    ev->type == GDK_BUTTON_RELEASE &&
+	    ev->button.button == 1 &&
 	    e.current_mouse_mode() == Editing::MouseDraw &&
 	    !e.drags()->active()) {