diff --git a/src/frontend/mame/luaengine.cpp b/src/frontend/mame/luaengine.cpp
index d7375f3414094..ab0dfe79ef103 100644
--- a/src/frontend/mame/luaengine.cpp
+++ b/src/frontend/mame/luaengine.cpp
@@ -2093,6 +2093,7 @@ void lua_engine::initialize()
 	ui_type["options"] = sol::property([] (mame_ui_manager &m) { return static_cast<core_options *>(&m.options()); });
 	ui_type["line_height"] = sol::property([] (mame_ui_manager &m) { return m.get_line_height(); });
 	ui_type["menu_active"] = sol::property(&mame_ui_manager::is_menu_active);
+	ui_type["show_menu"] = &mame_ui_manager::show_menu;
 	ui_type["ui_active"] = sol::property(&mame_ui_manager::ui_active, &mame_ui_manager::set_ui_active);
 	ui_type["single_step"] = sol::property(&mame_ui_manager::single_step, &mame_ui_manager::set_single_step);
 	ui_type["show_fps"] = sol::property(&mame_ui_manager::show_fps, &mame_ui_manager::set_show_fps);