diff --git a/plugins/auth-backend/config.d.ts b/plugins/auth-backend/config.d.ts
index cdd3fe1bf0..8d76ca8bf5 100644
--- a/plugins/auth-backend/config.d.ts
+++ b/plugins/auth-backend/config.d.ts
@@ -68,7 +68,7 @@ export interface Config {
            * @visibility secret
            */
           clientSecret: string;
-          callbackUrl: string;
+          callbackUrl?: string;
         };
       };
       github?: {