diff --git a/gtk2_ardour/luainstance.cc b/gtk2_ardour/luainstance.cc
index 70d88cdf5f..e26a712aff 100644
--- a/gtk2_ardour/luainstance.cc
+++ b/gtk2_ardour/luainstance.cc
@@ -207,6 +207,9 @@ LuaInstance::register_classes (lua_State* L)
 		.addFunction ("n_midi_regions", &RegionSelection::n_midi_regions)
 		.endClass ()
 
+		.beginClass <ArdourMarker> ("ArdourMarker")
+		.endClass ()
+
 		.beginClass <PublicEditor> ("Editor")
 		.addFunction ("snap_type", &PublicEditor::snap_type)
 		.addFunction ("snap_mode", &PublicEditor::snap_mode)