diff --git a/deployments/examples/ocis_traefik/docker-compose.yml b/deployments/examples/ocis_traefik/docker-compose.yml
index 05e4fd318eb..379ba65d2d6 100644
--- a/deployments/examples/ocis_traefik/docker-compose.yml
+++ b/deployments/examples/ocis_traefik/docker-compose.yml
@@ -73,7 +73,7 @@ services:
       NOTIFICATIONS_SMTP_PORT: 2500
       NOTIFICATIONS_SMTP_SENDER: oCIS notifications <notifications@${OCIS_DOMAIN:-ocis.owncloud.test}>
       NOTIFICATIONS_SMTP_USERNAME: notifications@${OCIS_DOMAIN:-ocis.owncloud.test}
-      NOTIFICATIONS_SMTP_INSECURE: true # the mail catcher uses self signed certificates
+      NOTIFICATIONS_SMTP_INSECURE: "true" # the mail catcher uses self signed certificates
     volumes:
       - ocis-config:/etc/ocis
       - ocis-data:/var/lib/ocis