diff --git a/brian_polling_manager/interface_stats/cli.py b/brian_polling_manager/interface_stats/cli.py
index 14996936ae8a4f97f567d17fa59f3bfb35df6b9d..8654850c9ff00edf338be57ba3bbca842326dda8 100644
--- a/brian_polling_manager/interface_stats/cli.py
+++ b/brian_polling_manager/interface_stats/cli.py
@@ -312,7 +312,7 @@ def cli(
                     logger.error("Thread stack trace:")
                     for line in traceback.format_stack(frame):
                         logger.error(line.strip())
-                    logger.error(f"-- Thread stack trace end --")
+                    logger.error("-- Thread stack trace end --")
             raise click.exceptions.Exit(2)
 
     except Exception: