diff --git a/docker-compose.yml b/docker-compose.yml
index f93874a69366e530b545c81e911a104cfc5cc342..f2a9751149dbdb2542b03d25b9bbf134050de8f4 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -35,6 +35,7 @@ services:
       - web.env
     image: gitlab.ub.uni-bielefeld.de:4567/sfb1288inf/opaque_daemon:latest
     volumes:
+      - storage:/mnt/opaque
       - ./logs:/home/opaque_daemon/logs
       - ../opaque_daemon/opaque_daemon.py:/home/opaque_daemon/opaque_daemon.py
       - $HOME/.docker/config.json:/home/opaque_daemon/.docker/config.json