diff --git a/duplicati/compose.yml b/duplicati/compose.yml
index 7eed1a1..4a57de9 100644
--- a/duplicati/compose.yml
+++ b/duplicati/compose.yml
@@ -7,6 +7,7 @@ services:
       - PUID=0
       - PGID=0
       - TZ=Europe/Amsterdam
+      - SETTINGS_ENCRYPTION_KEY=xK9#mP2$vL5nQ8wR
     volumes:
       - /opt/duplicati/config:/config
       - /var/lib/docker/volumes:/source:ro