diff --git a/gtk2_ardour/engine_dialog.cc b/gtk2_ardour/engine_dialog.cc
index 3e1337e62a..a7ef061d17 100644
--- a/gtk2_ardour/engine_dialog.cc
+++ b/gtk2_ardour/engine_dialog.cc
@@ -324,6 +324,7 @@ void
 EngineControl::on_show ()
 {
 	ArdourDialog::on_show ();
+	backend_changed ();
 	device_changed ();
 	ok_button->grab_focus();
 }