diff --git a/gtk2_ardour/piano_roll_header.cc b/gtk2_ardour/piano_roll_header.cc
index e88f551..a9baea8 100644
--- a/gtk2_ardour/piano_roll_header.cc
+++ b/gtk2_ardour/piano_roll_header.cc
@@ -585,6 +585,7 @@ PianoRollHeader::on_leave_notify_event (GdkEventCrossing*)
 	}
 
 	_highlighted_note = no_note;
+	_dragging = false;
 	return true;
 }