diff --git a/byte_infer_perf/llm_perf/core/perf_engine.py b/byte_infer_perf/llm_perf/core/perf_engine.py
index de86647b..20bbfb3f 100644
--- a/byte_infer_perf/llm_perf/core/perf_engine.py
+++ b/byte_infer_perf/llm_perf/core/perf_engine.py
@@ -112,7 +112,7 @@ def start_server(self, tp_size: int, batch_size: int):
             "torchrun",
             "--master_port",
             "19999",
-            "--nproc-per-node",
+            "--nproc_per_node",
             str(tp_size),
             "llm_perf/launch.py",
             "--task",