diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index a5878a2efd..48ffcf2f6b 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -979,6 +979,8 @@ LuaBindings::common (lua_State* L)
 		.deriveWSPtrClass <Stripable, SessionObject> ("Stripable")
 		.addCast<Route> ("to_route")
 		.addCast<VCA> ("to_vca")
+		.addCast<Slavable> ("to_slavable")
+		.addCast<Automatable> ("to_automatable")
 		.addFunction ("is_auditioner", &Stripable::is_auditioner)
 		.addFunction ("is_private_route", &Stripable::is_private_route)
 		.addFunction ("is_master", &Stripable::is_master)
@@ -1037,8 +1039,6 @@ LuaBindings::common (lua_State* L)
 
 		.deriveWSPtrClass <Route, Stripable> ("Route")
 		.addCast<Track> ("to_track")
-		.addCast<Automatable> ("to_automatable")
-		.addCast<Slavable> ("to_slavable")
 		.addFunction ("set_name", &Route::set_name)
 		.addFunction ("comment", &Route::comment)
 		.addFunction ("active", &Route::active)