diff --git a/python/sglang/bench_serving.py b/python/sglang/bench_serving.py
index 84d88e136..a35dfe500 100644
--- a/python/sglang/bench_serving.py
+++ b/python/sglang/bench_serving.py
@@ -1722,7 +1722,7 @@ if __name__ == "__main__":
         help="Suffix applied to the end of all user prompts, followed by assistant prompt suffix.",
     )
     parser.add_argument(
-        "--pd-seperated",
+        "--pd-separated",
         action="store_true",
         help="Benchmark PD disaggregation server",
     )