diff --git a/ecmascript/builtins/builtins_function.cpp b/ecmascript/builtins/builtins_function.cpp
index 18b164dfe100614b07cff43b4fa4c8d3d767376f..1208343edb0ffb3e0dbdcaece6eb390a863964fd 100644
--- a/ecmascript/builtins/builtins_function.cpp
+++ b/ecmascript/builtins/builtins_function.cpp
@@ -346,7 +346,8 @@ JSTaggedValue BuiltinsFunction::FunctionPrototypeToString(EcmaRuntimeCallInfo *a
         if (!sourceCode.empty()) {
             return GetTaggedString(thread, sourceCode.c_str());
         } else {
-            return GetTaggedString(thread, "Cannot get source code of funtion");
+            std::string emptyStr = "function(){}";
+            return GetTaggedString(thread, emptyStr.c_str());
         }
     }