diff --git a/roles/mail_forwarder/molecule/default/group_vars/parameters-mandatory.yml b/roles/mail_forwarder/molecule/default/group_vars/parameters-mandatory.yml
index 9dca40540130109a6cb72761f1249bb3c194113a..3c8b82e3aaca6c6c32013e7e3846dce74d5bd3cb 100644
--- a/roles/mail_forwarder/molecule/default/group_vars/parameters-mandatory.yml
+++ b/roles/mail_forwarder/molecule/default/group_vars/parameters-mandatory.yml
@@ -1,4 +1,3 @@
 ---
 
-# Global common parameters.
-tls_certificate_dir: tests/data/x509/
+smtp_relay_truststore: "{{ lookup('file', 'tests/data/x509/ca.cert.pem') }}"