diff --git a/gtk2_ardour/plugin_selector.cc b/gtk2_ardour/plugin_selector.cc
index a2790e1df0..dbc9dfb608 100644
--- a/gtk2_ardour/plugin_selector.cc
+++ b/gtk2_ardour/plugin_selector.cc
@@ -914,6 +914,9 @@ struct PluginMenuCompareByCreator {
 Gtk::Menu*
 PluginSelector::plugin_menu()
 {
+	if (_plugin_menu->get_attach_widget ()) {
+		_plugin_menu->detach ();
+	}
 	return _plugin_menu;
 }