diff --git a/gtk2_ardour/enums.cc b/gtk2_ardour/enums.cc
index b454dc82f7..44d5589d5c 100644
--- a/gtk2_ardour/enums.cc
+++ b/gtk2_ardour/enums.cc
@@ -187,6 +187,10 @@ setup_gtk_ardour_enums ()
 	REGISTER_ENUM (MinsecRulerItem);
 	REGISTER_ENUM (BBTRulerItem);
 	REGISTER_ENUM (SamplesRulerItem);
+	REGISTER_ENUM (SelectionMarkerItem);
+	REGISTER_ENUM (SelectionMarkerItem);
+	REGISTER_ENUM (DropZoneItem);
+	REGISTER_ENUM (GridZoneItem);
 	REGISTER_ENUM (VelocityItem);
 	REGISTER_ENUM (VelocityBaseItem);
 	REGISTER_ENUM (ClipStartItem);