diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 864424846e..b7cd02befd 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -1682,8 +1682,7 @@ static int32_t translateLength(SFunctionNode* pFunc, char* pErrBuf, int32_t len)
     return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
-  uint8_t paraType = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
-  if (!IS_STR_DATA_TYPE(paraType)) {
+  if (!IS_STR_DATA_TYPE(((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type)) {
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
   }