diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 4cfa91f1fc..9c8a3ad5a5 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -5688,6 +5688,15 @@ Session::setup_lua ()
 	LuaBindings::stddef (L);
 	LuaBindings::common (L);
 	LuaBindings::dsp (L);
+	luabridge::getGlobalNamespace (L)
+		.beginNamespace ("Ardour")
+		.beginClass <Session> ("Session")
+		/* thse are private to Session */
+		.addFunction ("rt_set_controls", &Session::rt_set_controls)
+		.addFunction ("rt_clear_all_solo_state", &Session::rt_clear_all_solo_state)
+		.endClass ()
+		.endNamespace ();
+
 	lua_mlock (L, 0);
 	luabridge::push <Session *> (L, this);
 	lua_setglobal (L, "Session");