diff --git a/lib/ldap/user.rb b/lib/ldap/user.rb
index ca000dbfc..681fe9028 100644
--- a/lib/ldap/user.rb
+++ b/lib/ldap/user.rb
@@ -162,7 +162,7 @@ class Ldap
     #
     # @return [String, nil] The active or found filter or nil if none could be found.
     def filter
-      @filter ||= lookup_filter(['(&(objectClass=user)(samaccountname=*)(!(samaccountname=*$)))', '(objectClass=user)', '(objectClass=posixaccount)'])
+      @filter ||= lookup_filter(['(&(objectClass=user)(samaccountname=*)(!(samaccountname=*$)))', '(objectClass=user)', '(objectClass=posixaccount)', '(objectClass=person)'])
     end
 
     # The active uid attribute of the instance. If none give on initialization an automatic lookup is performed.