diff --git a/compose.yml b/compose.yml
index f4e2ef0..4b7a461 100644
--- a/compose.yml
+++ b/compose.yml
@@ -98,6 +98,7 @@ services:
       - GRAMPSWEB_ADMIN_EMAIL=${GRAMPSWEB_ADMIN_EMAIL}
       - GRAMPSWEB_ADMIN_PASSWORD=${GRAMPSWEB_ADMIN_PASSWORD}
       - GRAMPSWEB_TREE=${GRAMPSWEB_TREE:-Stiftung}
+      - GRAMPSWEB_BASE_URL=/ahnenforschung
       - GRAMPSWEB_CELERY_CONFIG__broker_url=redis://redis:6379/0
       - GRAMPSWEB_CELERY_CONFIG__result_backend=redis://redis:6379/0
       - GRAMPSWEB_RATELIMIT_STORAGE_URI=redis://redis:6379/1