diff --git a/gtk2_ardour/selection.cc b/gtk2_ardour/selection.cc
index 8a6f04a6f7..724618e540 100644
--- a/gtk2_ardour/selection.cc
+++ b/gtk2_ardour/selection.cc
@@ -1025,6 +1025,7 @@ Selection::set (ControlPoint* cp)
 		cp->line().nth (i)->set_selected (false);
 	}
 
+	clear_points ();
 	add (cp);
 }