diff --git a/site-cookbooks/kosmos-ejabberd/templates/ejabberd.yml.erb b/site-cookbooks/kosmos-ejabberd/templates/ejabberd.yml.erb
index 020249f..9d6852f 100644
--- a/site-cookbooks/kosmos-ejabberd/templates/ejabberd.yml.erb
+++ b/site-cookbooks/kosmos-ejabberd/templates/ejabberd.yml.erb
@@ -189,6 +189,7 @@ modules:
       - allow: admin
     access_create: muc_create
     access_persistent: muc_create
+    max_user_conferences: 1000
     default_room_options:
       allow_subscription: true  # enable MucSub
       mam: true