diff --git a/src/eddn/Gateway.py b/src/eddn/Gateway.py
index 0ea2acd..18b49ac 100644
--- a/src/eddn/Gateway.py
+++ b/src/eddn/Gateway.py
@@ -405,7 +405,7 @@ class EnableCors(object):
         return _enable_cors
 
 
-def main():
+def main() -> None:
     """Handle setting up and running the bottle app."""
     cl_args = parse_cl_args()
     if cl_args.loglevel: