diff --git a/python/sglang/bench_one_batch_server.py b/python/sglang/bench_one_batch_server.py
index 1fc4ff58d..4cba2e589 100644
--- a/python/sglang/bench_one_batch_server.py
+++ b/python/sglang/bench_one_batch_server.py
@@ -26,6 +26,8 @@ from sglang.srt.entrypoints.http_server import launch_server
 from sglang.srt.server_args import ServerArgs
 from sglang.srt.utils import kill_process_tree
 
+multiprocessing.set_start_method("spawn", force=True)
+
 
 @dataclasses.dataclass
 class BenchArgs: