diff --git a/packages/core/src/oidc/init.ts b/packages/core/src/oidc/init.ts
index c4697f738..25473af05 100644
--- a/packages/core/src/oidc/init.ts
+++ b/packages/core/src/oidc/init.ts
@@ -131,9 +131,9 @@ export default async function initOidc(app: Koa): Promise<Provider> {
 
         // Add User Roles to the AccessToken claims. Should be removed once we have RBAC implemented.
         // User Roles should be hidden and  determined by the AccessToken scope only.
-        return {
+        return snakecaseKeys({
           roleNames,
-        };
+        });
       }
     },
   });