diff --git a/kscale/web/token.py b/kscale/web/token.py
index 114c418..fd30878 100644
--- a/kscale/web/token.py
+++ b/kscale/web/token.py
@@ -19,7 +19,7 @@
 
 
 class OAuthCallback:
-    def __init__(self):
+    def __init__(self) -> None:
         self.access_token = None
         self.app = web.Application()
         self.app.router.add_get("/token", self.handle_token)