diff --git a/roles/mail/tasks/frontend.yml b/roles/mail/tasks/frontend.yml
index bd410d5f563221a7ac1a5d130ce0463049d18ada..93363596233035fb160c0a230a7f1e4765decceb 100644
--- a/roles/mail/tasks/frontend.yml
+++ b/roles/mail/tasks/frontend.yml
@@ -39,7 +39,7 @@
 
 - name: Install DH params for dovecot
   copy:
-    src: "{{ credentials_dir }}/x509/dhparam"
+    src: "{{ credentials_dir }}/x509/dhparam-{{ dhparam_bits | default('2048') }}"
     dest: "/etc/dovecot/dh.pem"
 
 - include_tasks: dovecot.yml