diff --git a/ecmascript/builtins/builtins_regexp.cpp b/ecmascript/builtins/builtins_regexp.cpp
index 74c6b78054530e2892ed8077b594020c86af6f8c..4dd84736be5683b19cca292cd86237ea41d987f2 100644
--- a/ecmascript/builtins/builtins_regexp.cpp
+++ b/ecmascript/builtins/builtins_regexp.cpp
@@ -303,11 +303,7 @@ JSTaggedValue BuiltinsRegExp::GetFlags(EcmaRuntimeCallInfo *argv)
     }
     // 3. Let result be the empty String.
     // 4. ~ 19.
-    if (!JSHandle<JSObject>::Cast(thisObj)->IsJSRegExp()) {
-        return GetAllFlagsInternal(thread, thisObj);
-    }
-    uint8_t flagsBits = static_cast<uint8_t>(JSRegExp::Cast(thisObj->GetTaggedObject())->GetOriginalFlags().GetInt());
-    return FlagsBitsToString(thread, flagsBits);
+    return GetAllFlagsInternal(thread, thisObj);
 }
 
 JSTaggedValue BuiltinsRegExp::GetAllFlagsInternal(JSThread *thread, JSHandle<JSTaggedValue> &thisObj)