diff --git a/playbooks/templates/storage_cassandra.yml b/playbooks/templates/storage_cassandra.yml
index 7c3c930..d1ca350 100644
--- a/playbooks/templates/storage_cassandra.yml
+++ b/playbooks/templates/storage_cassandra.yml
@@ -1,10 +1,11 @@
 storage:
-  cls: cassandra
-  args:
-    hosts:
-    - {% if seed_addresses is defined %}{{seed_addresses}}{% else %}{{listen_address}}{% endif %}
+  cls: validate
+  storage:
+    cls: cassandra
+    args:
+      hosts: {% if seed_addresses is defined %}{{seed_addresses}}{% else %}[{{listen_address}}]{% endif %}
 
-    keyspace: swh_test
-    objstorage:
-      cls: memory
-      args: {}
+      keyspace: swh_test
+      objstorage:
+        cls: memory
+        args: {}