diff --git a/gtk2_ardour/add_route_dialog.cc b/gtk2_ardour/add_route_dialog.cc
index 3c2cdcacca..7c461ce6c9 100644
--- a/gtk2_ardour/add_route_dialog.cc
+++ b/gtk2_ardour/add_route_dialog.cc
@@ -857,6 +857,7 @@ AddRouteDialog::on_show ()
 	reset_name_edited ();
 
 	refill_route_groups ();
+	refill_channel_setups ();
 
 	Dialog::on_show ();
 }