diff --git a/sleepproxyclient.py b/sleepproxyclient.py
index 782ea1d..e96d323 100644
--- a/sleepproxyclient.py
+++ b/sleepproxyclient.py
@@ -459,7 +459,7 @@ def parse_arguments() -> argparse.Namespace:
         "format": "%(asctime)s spc[%(process)d] %(levelname)s %(filename)s[%(funcName)s:%(lineno)d] %(message)s",
         "datefmt": "%b %d %Y %H:%M:%S",
     }
-    if args.debug is not None:
+    if args.debug:
         logging_config["level"] = logging.DEBUG
     if args.logfile is not None:
         logging_config["filename"] = args.logfile