diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index e53b58daa27b23f32c4487b38c8de8b3afd7cb7f..7e1c378584a58ae16bf073040a50ee0d5d25c44c 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -1841,7 +1841,7 @@ static void doSetSqlExprAndResultFieldInfo(SQueryInfo* pQueryInfo, SQueryInfo* p
   for (int32_t i = 0; i < numOfExprs; ++i) {
     SSqlExpr* pExpr = tscSqlExprGet(pNewQueryInfo, i);
 
-    TAOS_FIELD f = tscCreateField(pExpr->resType, pExpr->aliasName, pExpr->resBytes);
+    TAOS_FIELD f = tscCreateField((int8_t) pExpr->resType, pExpr->aliasName, pExpr->resBytes);
     SInternalField* pInfo1 = tscFieldInfoAppend(&pNewQueryInfo->fieldsInfo, &f);
     pInfo1->pSqlExpr = pExpr;
   }