diff --git a/src/mnode/src/mnodeTable.c b/src/mnode/src/mnodeTable.c
index 23b62f1aa36acc44c311fa3772cf4292a9a7d9b8..5ebfb164dfbbe3342b33f4ffda35f6cbb866e90c 100644
--- a/src/mnode/src/mnodeTable.c
+++ b/src/mnode/src/mnodeTable.c
@@ -1987,7 +1987,7 @@ 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);