diff --git a/testsite/group_vars/xmpp.yml b/testsite/group_vars/xmpp.yml
index 7e4adc1c4b6a42220c9686313d9468effbcf6954..0ffc346631d4b32cc5b6322ccb0d46d5c0233e7e 100644
--- a/testsite/group_vars/xmpp.yml
+++ b/testsite/group_vars/xmpp.yml
@@ -10,8 +10,7 @@ prosody_tls_certificate: /etc/prosody/certs/localhost.crt
 prosody_domains:
   - example.com
 
-prosody_conference_fqdn:
-  - conference.example.com
+prosody_conference_fqdn: conference.example.com
 
 prosody_proxy_fqdn: proxy.example.com