diff --git a/gtk2_ardour/velocity_display.cc b/gtk2_ardour/velocity_display.cc
index def06de4fd..b6b3c5d5ba 100644
--- a/gtk2_ardour/velocity_display.cc
+++ b/gtk2_ardour/velocity_display.cc
@@ -153,6 +153,7 @@ VelocityDisplay::clear ()
 		delete ev.second;
 	}
 	events.clear ();
+	_optimization_iterator = events.end();
 }
 
 void