diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 82322d43b8efc2c921f678d1afed868968b7bf41..c7f8791d6de658fc21187de849945182f44840be 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -1989,7 +1989,7 @@ static int32_t mnodeAutoCreateChildTable(SMnodeMsg *pMsg) {
   pCreateMsg->getMeta = 1;
   pCreateMsg->contLen = htonl(contLen);
 
-  memcpy(pCreateMsg->schema, pTags, contLen);
+  memcpy(pCreateMsg->schema, pTags, contLen - sizeof(SCMCreateTableMsg));
   mDebug("app:%p:%p, table:%s, start to create on demand, tagLen:%d stable:%s",
          pMsg->rpcMsg.ahandle, pMsg, pInfo->tableId, tagLen, pTags->name);