diff --git a/vllm/benchmarks/serve.py b/vllm/benchmarks/serve.py
index 71d136d61cea..4b15d8e62913 100644
--- a/vllm/benchmarks/serve.py
+++ b/vllm/benchmarks/serve.py
@@ -26,6 +26,7 @@
 import random
 import shutil
 import time
+import uuid
 import warnings
 from collections.abc import AsyncGenerator, Iterable
 from dataclasses import dataclass
@@ -1160,7 +1161,7 @@ def add_cli_args(parser: argparse.ArgumentParser):
         "--request-id-prefix",
         type=str,
         required=False,
-        default="benchmark-serving",
+        default=f"bench-{uuid.uuid4().hex[:8]}-",
         help="Specify the prefix of request id.",
     )