diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index c9d556c86b42dfe8fab7e4a2c2056a1aebb03c49..4725f117150ec3211bb402a042d68bdd667a8003 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -703,7 +703,7 @@ static int32_t translateFirstLast(SFunctionNode* pFunc, char* pErrBuf, int32_t l
 
 static int32_t translateUnique(SFunctionNode* pFunc, char* pErrBuf, int32_t len) {
   if (1 != LIST_LENGTH(pFunc->pParameterList)) {
-    return TSDB_CODE_SUCCESS;
+    return invaildFuncParaNumErrMsg(pErrBuf, len, pFunc->functionName);
   }
 
   SNode* pPara = nodesListGetNode(pFunc->pParameterList, 0);