diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index a3f5abdbfd3e3a2d038a49e07152f5ef3bbc9187..e12597e32dd6ddce1d4b5d60a74d379ecc903a20 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1548,7 +1548,7 @@ int tscBuildCompactMsg(SSqlObj *pSql, SSqlInfo *pInfo) {
   STscObj *pObj = pSql->pTscObj;
   SSqlCmd *pCmd = &pSql->cmd;
   SArray *pList = pInfo->list;
-  int32_t size  = taosArrayGetSize(pList);
+  int32_t size  = (int32_t)taosArrayGetSize(pList);
 
   int32_t *result = malloc(sizeof(int32_t) * size);
   if (result == NULL) {