diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 25d14607f68d17d330f0637508e4264785c0e891..e1cae0d05427e0a46e1f95c9fa4f0a0b8e085fe2 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -2950,7 +2950,7 @@ static int32_t mnodeProcessMultiTableMetaMsg(SMnodeMsg *pMsg) {
     msg = serializeVgroupInfo(pTable, name, msg, pMsg, pMsg->rpcMsg.ahandle);
   }
 
-  pMultiMeta->contLen = (msg - (char*) pMultiMeta);
+  pMultiMeta->contLen = (int32_t) (msg - (char*) pMultiMeta);
 
   pMultiMeta->numOfTables = htonl(pMultiMeta->numOfTables);
   pMsg->rpcRsp.rsp = pMultiMeta;