diff --git a/config/config.ini.sample b/config/config.ini.sample
--- a/config/config.ini.sample
+++ b/config/config.ini.sample
@@ -34,7 +34,7 @@
 ; base_dn and filter can use these variables:
 ; %dc = domain root dn, %u = username part, %s = the full username
 base_dn = "ou=People,dc=example,dc=org"
-filter = "(&(objectClass=kolabInetOrgPerson)(|(mail=%s)(alias=%s))"
+filter = "(&(objectClass=kolabInetOrgPerson)(|(mail=%s)(alias=%s)))"
 mail_attributes = mail
 lc_attributes = mail
 primary_domain = "example.org"