diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 6837976ba2ac72c9763ceb7d66ac190e40d54430..dbd626d360fa6948396753bb7c76da7e5f8dcf23 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -788,7 +788,7 @@ static int32_t getRowExpandSize(STableMeta* pTableMeta) {
 }
 
 static void extractTableMeta(SSqlCmd* pCmd) {
-  pCmd->numOfTables = taosHashGetSize(pCmd->pTableBlockHashList);
+  pCmd->numOfTables = (int32_t) taosHashGetSize(pCmd->pTableBlockHashList);
   pCmd->pTableMetaList = calloc(pCmd->numOfTables, POINTER_BYTES);
 
   STableDataBlocks **p1 = taosHashIterate(pCmd->pTableBlockHashList, NULL);