diff --git a/evals/benchmark/stresscli/locust/aistress.py b/evals/benchmark/stresscli/locust/aistress.py
index 795974bf..4dbc220a 100644
--- a/evals/benchmark/stresscli/locust/aistress.py
+++ b/evals/benchmark/stresscli/locust/aistress.py
@@ -251,7 +251,7 @@ def on_reqcount(msg, **kwargs):
 
 
 def on_quit(environment, msg, **kwargs):
-    logging.debug(f"Test quitting, set stop_timeout to 0...")
+    logging.debug("Test quitting, set stop_timeout to 0...")
     environment.runner.environment.stop_timeout = 0