diff --git a/src/gui/luainstance.cpp b/src/gui/luainstance.cpp
index a0785436c..6ea65173d 100644
--- a/src/gui/luainstance.cpp
+++ b/src/gui/luainstance.cpp
@@ -262,12 +262,16 @@ static void set_lua_variables(lua_State *L)
 	};
 
 	/* screen offsets, exported as e.g. SCREEN['END_Y'] */
+	lua_Integer xRes = (lua_Integer)CFrameBuffer::getInstance()->getScreenWidth(true);
+	lua_Integer yRes = (lua_Integer)CFrameBuffer::getInstance()->getScreenHeight(true);
 	table_key screenopts[] =
 	{
 		{ "OFF_X", g_settings.screen_StartX },
 		{ "OFF_Y", g_settings.screen_StartY },
 		{ "END_X", g_settings.screen_EndX },
 		{ "END_Y", g_settings.screen_EndY },
+		{ "X_RES", xRes },
+		{ "Y_RES", yRes },
 		{ NULL, 0 }
 	};
 	table_key menureturn[] =
diff --git a/src/gui/luainstance.h b/src/gui/luainstance.h
index 1c0887d72..99bd0b4b0 100644
--- a/src/gui/luainstance.h
+++ b/src/gui/luainstance.h
@@ -34,7 +34,7 @@ extern "C" {
 #include <vector>
 
 #define LUA_API_VERSION_MAJOR 1
-#define LUA_API_VERSION_MINOR 8
+#define LUA_API_VERSION_MINOR 9
 
 /* this is stored as userdata in the lua_State */
 struct CLuaData