diff --git a/source/libs/function/src/tudf.c b/source/libs/function/src/tudf.c
index 03a3891a4c..192e04c9a3 100644
--- a/source/libs/function/src/tudf.c
+++ b/source/libs/function/src/tudf.c
@@ -1287,7 +1287,7 @@ int32_t doSetupUdf(char udfName[], UdfcFuncHandle *funcHandle) {
   task->type = UDF_TASK_SETUP;
 
   SUdfSetupRequest *req = &task->_setup.req;
-  memcpy(req->udfName, udfName, TSDB_FUNC_NAME_LEN);
+  strncpy(req->udfName, udfName, TSDB_FUNC_NAME_LEN);
 
   int32_t errCode = udfcRunUdfUvTask(task, UV_TASK_CONNECT);
   if (errCode != 0) {