diff --git a/gtk2_ardour/processor_box.cc b/gtk2_ardour/processor_box.cc
index bd84d4ca0a..7b784022fa 100644
--- a/gtk2_ardour/processor_box.cc
+++ b/gtk2_ardour/processor_box.cc
@@ -293,6 +293,7 @@ Gtk::Menu*
 ProcessorBox::build_possible_aux_menu ()
 {
 	boost::shared_ptr<RouteList> rl = _session.get_routes_with_internal_returns();
+
 	if (rl->empty()) {
 		return 0;
 	}
@@ -301,7 +302,6 @@ ProcessorBox::build_possible_aux_menu ()
 	Menu* menu = manage (new Menu);
 	MenuList& items = menu->items();
 
-
 	for (RouteList::iterator r = rl->begin(); r != rl->end(); ++r) {
 		if (!(*r)->internal_send_for (*r)) {
 			items.push_back (MenuElem ((*r)->name(), bind (sigc::ptr_fun (ProcessorBox::rb_choose_aux), boost::weak_ptr<Route>(*r))));
@@ -341,7 +341,8 @@ ProcessorBox::show_processor_menu (gint arg)
 		if (m) {
 			aux_menu_item->set_submenu (*m);
 		} else {
-			/* XXX WHAT?*/
+			/* stupid gtkmm: we need to pass a null reference here */
+			aux_menu_item->set_submenu (*((Gtk::Menu *)0));
 		}
 	}
 
diff --git a/libs/ardour/enums.cc b/libs/ardour/enums.cc
index 4b0ec3b343..72aa5bef55 100644
--- a/libs/ardour/enums.cc
+++ b/libs/ardour/enums.cc
@@ -515,6 +515,7 @@ setup_enum_writer ()
 	REGISTER_CLASS_ENUM (Delivery, Send);
 	REGISTER_CLASS_ENUM (Delivery, Listen);
 	REGISTER_CLASS_ENUM (Delivery, Main);
+	REGISTER_CLASS_ENUM (Delivery, Aux);
 	REGISTER_BITS (_Delivery_Role);
 
 	REGISTER_CLASS_ENUM (MuteMaster, PreFader);