diff --git a/gtk2_ardour/triggerbox_ui.cc b/gtk2_ardour/triggerbox_ui.cc
index 7b183440a9..8f13d9f91a 100644
--- a/gtk2_ardour/triggerbox_ui.cc
+++ b/gtk2_ardour/triggerbox_ui.cc
@@ -567,7 +567,7 @@ TriggerBoxWidget::on_map ()
 void
 TriggerBoxWidget::on_unmap ()
 {
-	GtkCanvas::on_map ();
+	GtkCanvas::on_unmap ();
 	ui->stop_updating ();
 }