diff --git a/cocos/scripting/lua-bindings/manual/cocostudio/CustomGUIReader.cpp b/cocos/scripting/lua-bindings/manual/cocostudio/CustomGUIReader.cpp
index bb8d05a1b9..3673311eae 100644
--- a/cocos/scripting/lua-bindings/manual/cocostudio/CustomGUIReader.cpp
+++ b/cocos/scripting/lua-bindings/manual/cocostudio/CustomGUIReader.cpp
@@ -76,9 +76,9 @@ namespace cocostudio
             customOptions.Accept(writer);
 
             auto stack = LuaEngine::getInstance()->getLuaStack();
-            stack->pushString(classType.c_str(), classType.size());
+            stack->pushString(classType.c_str(), static_cast<int>(classType.size()));
             stack->pushObject(widget, "cc.Ref");
-            stack->pushString(buffer.GetString(), buffer.Size());
+            stack->pushString(buffer.GetString(), static_cast<int>(buffer.GetSize()));
             stack->executeFunctionByHandler(_setPropsFunc, 3);
         }
 	}