diff --git a/sat/plugins/plugin_misc_lists.py b/sat/plugins/plugin_misc_lists.py
index 0d38fefa..cd53fcf6 100644
--- a/sat/plugins/plugin_misc_lists.py
+++ b/sat/plugins/plugin_misc_lists.py
@@ -210,6 +210,7 @@ class PubsubLists:
         self._s = self.host.plugins["XEP-0346"]
         self.namespace = self._s.getSubmittedNS(APP_NS_TICKETS)
         host.registerNamespace("tickets", APP_NS_TICKETS)
+        host.registerNamespace("tickets_type", NS_TICKETS_TYPE)
         self.host.plugins["PUBSUB_INVITATION"].register(
             APP_NS_TICKETS, self
         )