diff --git a/roles/xmpp_server/molecule/default/group_vars/parameters-mandatory.yml b/roles/xmpp_server/molecule/default/group_vars/parameters-mandatory.yml
index 57596b9126bf453d96371c90e76de9e15a9b4628..2be4418cc81730b58d194afe184d881895d2a4fb 100644
--- a/roles/xmpp_server/molecule/default/group_vars/parameters-mandatory.yml
+++ b/roles/xmpp_server/molecule/default/group_vars/parameters-mandatory.yml
@@ -5,10 +5,8 @@ xmpp_administrators:
 xmpp_ldap_base_dn: dc=local
 xmpp_ldap_password: prosodypassword
 xmpp_ldap_server: ldap-server
-
-# Common parameters (general, not role).
-tls_certificate_dir: tests/data/x509/
-tls_private_key_dir: tests/data/x509/
+xmpp_tls_certificate: "{{ lookup('file', 'tests/data/x509/{{ inventory_hostname }}_xmpp.cert.pem') }}"
+xmpp_tls_key: "{{ lookup('file', 'tests/data/x509/{{ inventory_hostname }}_xmpp.key.pem') }}"
 
 # common
 ca_certificates: