diff --git a/mail-server.nix b/mail-server.nix
index 01525ff..100156b 100644
--- a/mail-server.nix
+++ b/mail-server.nix
@@ -210,6 +210,7 @@ in {
             "auth_bind_userdn = cn=%u,${cfg.ldap.member-ou},${cfg.ldap.base}"
             "base = ${cfg.ldap.base}"
             "user_filter = (&(objectClass=organizationalPerson)(cn=%n))"
+            "user_attrs = =user=%n"
           ]);
         target-file = "/run/dovecot-secret/ldap.conf";
       };