diff --git a/tests/ldap.nix b/tests/ldap.nix
index 40b1390..2999bd8 100644
--- a/tests/ldap.nix
+++ b/tests/ldap.nix
@@ -125,6 +125,7 @@ in
           fqdn = "mail.example.com";
           domains = [ "example.com" ];
           localDnsResolver = false;
+          mailDirectory = "/var/lib/dovecot/vmail";
           indexDir = "/var/lib/dovecot/indices";
 
           aliases = {