diff --git a/source/libs/transport/src/transCli.c b/source/libs/transport/src/transCli.c
index 8c65a3ac1b..246605694b 100644
--- a/source/libs/transport/src/transCli.c
+++ b/source/libs/transport/src/transCli.c
@@ -1910,7 +1910,7 @@ static void* cliWorkThread(void* arg) {
 
   char    threadName[TSDB_LABEL_LEN] = {0};
   STrans* pInst = pThrd->pTransInst;
-  strntolower(threadName, pInst->label, sizeof(threadName));
+  strtolower(threadName, pInst->label);
   setThreadName(threadName);
 
   uv_run(pThrd->loop, UV_RUN_DEFAULT);