diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index c4a8440ef60d14bb335a94d5dd8ac7830016ac42..d2091e45acff35a0e14841021fe1f673479a0d6d 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -157,6 +157,7 @@ void tscProcessActivityTimer(void *handle, void *tmrId) {
       return;
     }
 
+    pSql->cmd.command = TSDB_SQL_HB;
     pSql->param = pObj;
     pSql->pTscObj = pObj;
     pSql->signature = pSql;