diff --git a/roles/mail_server/molecule/default/prepare.yml b/roles/mail_server/molecule/default/prepare.yml
index 5d424899213f12d9da906fd2ea7f50d8f8b721a2..93303a1c894c75abdf229df8e4b3b94c7e02d6ba 100644
--- a/roles/mail_server/molecule/default/prepare.yml
+++ b/roles/mail_server/molecule/default/prepare.yml
@@ -22,7 +22,7 @@
           - "server"
           - "{{ item.name }}"
           - "{{ item.fqdn }}"
-          - "{{ item.fqdn[:item.fqdn.rfind('-')] }}"
+          - "{{ item.fqdn[: item.fqdn.rfind('-')] }}"
       with_items:
         - name: clamav-database_https
           fqdn: database.clamav.net