diff --git a/roles/mail_server/molecule/default/group_vars/parameters-optional.yml b/roles/mail_server/molecule/default/group_vars/parameters-optional.yml
index ae316e74ad990e756e4b91acb0457b840cd7f0aa..45e2a4f49ed19fbc0c2210195f5e1b40e9d7801a 100644
--- a/roles/mail_server/molecule/default/group_vars/parameters-optional.yml
+++ b/roles/mail_server/molecule/default/group_vars/parameters-optional.yml
@@ -15,12 +15,12 @@ mail_user: virtmail
 mail_user_uid: 5000
 mail_user_gid: 5000
 imap_max_user_connections_per_ip: 2
-imap_tls_certificate: "{{ lookup('file', 'tests/data/x509/parameters-optional_imap.cert.pem') }}"
-imap_tls_key: "{{ lookup('file', 'tests/data/x509/parameters-optional_imap.key.pem') }}"
+imap_tls_certificate: "{{ lookup('file', 'tests/data/x509/{{ inventory_hostname }}_imap.cert.pem') }}"
+imap_tls_key: "{{ lookup('file', 'tests/data/x509/{{ inventory_hostname }}_imap.key.pem') }}"
 local_mail_aliases:
   root: "john.doe@domain1"
-smtp_tls_certificate: "{{ lookup('file', 'tests/data/x509/parameters-optional_smtp.cert.pem') }}"
-smtp_tls_key: "{{ lookup('file', 'tests/data/x509/parameters-optional_smtp.key.pem') }}"
+smtp_tls_certificate: "{{ lookup('file', 'tests/data/x509/{{ inventory_hostname }}_smtp.cert.pem') }}"
+smtp_tls_key: "{{ lookup('file', 'tests/data/x509/{{ inventory_hostname }}_smtp.key.pem') }}"
 imap_folder_separator: "."
 smtp_rbl:
   - bl.spamcop.net