diff --git a/source/dnode/mnode/impl/src/mndDnode.c b/source/dnode/mnode/impl/src/mndDnode.c
index dc1aa2e1ef..6030c40789 100644
--- a/source/dnode/mnode/impl/src/mndDnode.c
+++ b/source/dnode/mnode/impl/src/mndDnode.c
@@ -898,7 +898,7 @@ static int32_t mndProcessStatusReq(SRpcMsg *pReq) {
     pDnode->numOfDiskCfg = statusReq.numOfDiskCfg;
     pDnode->memAvail = statusReq.memAvail;
     pDnode->memTotal = statusReq.memTotal;
-    if (pDnode->machineId[0] == 0 && statusReq.machineId[0] != 0) {
+    if (memcmp(pDnode->machineId, statusReq.machineId, TSDB_MACHINE_ID_LEN) != 0) {
       tstrncpy(pDnode->machineId, statusReq.machineId, TSDB_MACHINE_ID_LEN + 1);
       mndUpdateDnodeObj(pMnode, pDnode);
     }