diff --git a/testsite/group_vars/xmpp.yml b/testsite/group_vars/xmpp.yml
index 8dfad6cb414ff54d78700690f9f35e989361a07f..4229ecdf74b170996b8cd194482ac85d1a3aa3e9 100644
--- a/testsite/group_vars/xmpp.yml
+++ b/testsite/group_vars/xmpp.yml
@@ -10,9 +10,9 @@ smtp_relay_truststore: /etc/ssl/certs/ca.pem
 xmpp_administrators:
   - john.doe@{{ testsite_domain }}
 
-xmpp_tls_key: "{{ inventory_dir }}/tls/xmpp.{{ testsite_domain }}_xmpp.key"
+xmpp_tls_key: "{{ lookup('file', inventory_dir + '/tls/xmpp.' + testsite_domain + '_xmpp.key') }}"
 
-xmpp_tls_certificate: "{{ inventory_dir }}/tls/xmpp.{{ testsite_domain }}_xmpp.pem"
+xmpp_tls_certificate: "{{ lookup('file', inventory_dir + '/tls/xmpp.' + testsite_domain + '_xmpp.pem') }}"
 
 xmpp_domains:
   - "{{ testsite_domain }}"