diff --git a/src/emu/luaengine.h b/src/emu/luaengine.h
index 908a82a8f0b..0098550e07c 100644
--- a/src/emu/luaengine.h
+++ b/src/emu/luaengine.h
@@ -138,6 +138,7 @@ private:
 	struct lua_screen {
 		int l_height(lua_State *L);
 		int l_width(lua_State *L);
+		int l_rotate(lua_State *L);
 		int l_refresh(lua_State *L);
 		int l_type(lua_State *L);
 		int l_snapshot(lua_State *L);