diff --git a/include/common/tmsgdef.h b/include/common/tmsgdef.h
index fdfbdcc3f8..6f15d7df70 100644
--- a/include/common/tmsgdef.h
+++ b/include/common/tmsgdef.h
@@ -388,6 +388,7 @@
   TD_NEW_MSG_SEG(TDMT_MND_ARB_MSG)  //9 << 8
   TD_DEF_MSG_TYPE(TDMT_MND_ARB_HEARTBEAT_TIMER, "mnd-arb-hb-tmr", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_MND_ARB_CHECK_SYNC_TIMER, "mnd-arb-check-sync-tmr", NULL, NULL)
+  TD_DEF_MSG_TYPE(TDMT_MND_ARB_UPDATE_GROUP, "mnd-arb-update-group", NULL, NULL) // no longer used
   TD_DEF_MSG_TYPE(TDMT_MND_ARB_UPDATE_GROUP_BATCH, "mnd-arb-update-group-batch", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_MND_ARB_MAX_MSG, "mnd-arb-max", NULL, NULL)
   TD_CLOSE_MSG_SEG(TDMT_END_ARB_MSG)