diff --git a/mastus/mail.nix b/mastus/mail.nix
index 85ba5a8..29ff3b5 100644
--- a/mastus/mail.nix
+++ b/mastus/mail.nix
@@ -82,7 +82,7 @@
     };
     script = ''
       cd /var/lib/acme
-      mkdir gebner.org-dovecot
+      mkdir -p gebner.org-dovecot
       cp gebner.org/key.pem gebner.org-dovecot/key.pem
       chown dovecot2 gebner.org-dovecot/key.pem
     '';