diff --git a/examples/server/bench/bench.py b/examples/server/bench/bench.py
index 6ca637bdd..86c5de101 100644
--- a/examples/server/bench/bench.py
+++ b/examples/server/bench/bench.py
@@ -268,6 +268,7 @@ def start_server_background(args):
     server_args.extend(['--defrag-thold', "0.1"])
     server_args.append('--cont-batching')
     server_args.append('--metrics')
+    server_args.append('--flash-attn')
     server_args.extend(['--log-format', "text"])
     args = [str(arg) for arg in [server_path, *server_args]]
     print(f"bench: starting server with: {' '.join(args)}")