diff --git a/app.py b/app.py
index 3c24a62..136ef77 100644
--- a/app.py
+++ b/app.py
@@ -96,7 +96,7 @@ if __name__ == "__main__":
     logger.add("output_{time}.log", format="{name} {message}", level="DEBUG", rotation="5 MB", backtrace=True, colorize=True, diagnose=True)
 
     if len(sys.argv) != 7:
-        logger.exception{"Usage: python3 app.py <caldav_url> <calendar_name> <username> <password> <ra_api_key> [OPTIONAL] <ra_username>"}
+        logger.exception("Usage: python3 app.py <caldav_url> <calendar_name> <username> <password> <ra_api_key> [OPTIONAL] <ra_username>")
         sys.exit(1)
 
     CALDAV_URL = sys.argv[1]