diff --git a/r2/r2/controllers/oauth2.py b/r2/r2/controllers/oauth2.py
index bee7608c7..49deb4ff3 100644
--- a/r2/r2/controllers/oauth2.py
+++ b/r2/r2/controllers/oauth2.py
@@ -218,7 +218,7 @@ class OAuth2AccessController(MinimalController):
             if access_token:
                 resp["access_token"] = access_token._id
                 resp["token_type"] = access_token.token_type
-                resp["expires_in"] = access_token._ttl
+                resp["expires_in"] = int(access_token._ttl) if access_token._ttl else None
                 resp["scope"] = access_token.scope
                 if refresh_token:
                     resp["refresh_token"] = refresh_token._id