diff --git a/website/web/helpers.py b/website/web/helpers.py
index cc8aacc..65a7c8a 100644
--- a/website/web/helpers.py
+++ b/website/web/helpers.py
@@ -51,7 +51,7 @@ def load_user_from_request(request: Request) -> User | None:
     return None
 
 def is_valid_username(username: str) -> bool:
-  return re.match("^[A-Za-z0-9]+$", username)
+  return bool(re.match("^[A-Za-z0-9]+$", username))
 
 @lru_cache(64)
 def build_keys_table() -> dict[str, str]: