diff --git a/lib/roundcube.sh b/lib/roundcube.sh
index cd65605..484a8dd 100644
--- a/lib/roundcube.sh
+++ b/lib/roundcube.sh
@@ -161,6 +161,10 @@ cat >> /federated/apps/authelia/data/config/idproviders.yml <<EOF
           - 'openid'
           - 'profile'
           - 'email'
+          - 'offline_access'
+        grant_types:
+          - refresh_token
+          - authorization_code
         userinfo_signed_response_alg: 'none'
         token_endpoint_auth_method: 'client_secret_post'
 EOF