diff --git a/tests/benchmark/milvus_benchmark/runners/locust_user.py b/tests/benchmark/milvus_benchmark/runners/locust_user.py
index e7a19aa7f8..60f56f44da 100644
--- a/tests/benchmark/milvus_benchmark/runners/locust_user.py
+++ b/tests/benchmark/milvus_benchmark/runners/locust_user.py
@@ -45,7 +45,7 @@ class StepLoadShape(LoadTestShape):
             return None
 
         current_step = math.floor(run_time / self.step_time) + 1
-        return (current_step * self.step_load, self.spawn_rate)
+        return current_step * self.step_load, self.spawn_rate
 
 
 class MyUser(User):