diff --git a/plinth/modules/email/data/etc/dovecot/conf.d/freedombox-ldap.conf.ext b/plinth/modules/email/data/etc/dovecot/conf.d/freedombox-ldap.conf.ext
index 708caf22a..66168b4bf 100644
--- a/plinth/modules/email/data/etc/dovecot/conf.d/freedombox-ldap.conf.ext
+++ b/plinth/modules/email/data/etc/dovecot/conf.d/freedombox-ldap.conf.ext
@@ -3,6 +3,6 @@
 # See: https://wiki.dovecot.org/AuthDatabase/LDAP/AuthBinds
 
 uris = ldapi:///
-base =
+base = dc=thisbox
 auth_bind = yes
 auth_bind_userdn = uid=%u,ou=users,dc=thisbox