diff --git a/apps/contacts/ajax/contacts.php b/apps/contacts/ajax/contacts.php
index beed3f05d5dc83c50214d6c6bc93042ba136863b..bf4d5deb2e03e069d017b7f10e0c6d8201070be6 100644
--- a/apps/contacts/ajax/contacts.php
+++ b/apps/contacts/ajax/contacts.php
@@ -46,7 +46,7 @@ foreach($contacts_addressbook as $addressbook_id => $contacts) {
 	}
 }
 
-usort($contacts_addressbook, 'cmp');
+uasort($contacts_addressbook, 'cmp');
 
 $tmpl = new OCP\Template("contacts", "part.contacts");
 $tmpl->assign('books', $contacts_addressbook, false);