diff --git a/docker/swarm/stack/ldap.yml b/docker/swarm/stack/ldap.yml
index 14e8b37..fbb74bc 100644
--- a/docker/swarm/stack/ldap.yml
+++ b/docker/swarm/stack/ldap.yml
@@ -1,3 +1,5 @@
+classes:
+- system.docker.client.images.ldap
 parameters:
   docker:
     client: