diff --git a/source/os/src/osSysinfo.c b/source/os/src/osSysinfo.c
index 7521ae4e0f..aeaa4fcafd 100644
--- a/source/os/src/osSysinfo.c
+++ b/source/os/src/osSysinfo.c
@@ -834,7 +834,11 @@ int32_t taosGetSystemUUID(char *uid, int32_t uidlen) {
   uuid_generate(uuid);
   // it's caller's responsibility to make enough space for `uid`, that's 36-char + 1-null
   uuid_unparse_lower(uuid, buf);
-  memcpy(uid, buf, uidlen);
+  int n = snprintf(uid, uidlen, "%.*s", (int)sizeof(buf), buf);  // though less performance, much safer
+  if (n >= uidlen) {
+    // target buffer is too small
+    return -1;
+  }
   return 0;
 #else
   int len = 0;