diff --git a/apps/contacts/ajax/categories/rescan.php b/apps/contacts/ajax/categories/rescan.php
new file mode 100644
index 0000000000000000000000000000000000000000..dd27192baa0a28296a24a52e778b353688dc1386
--- /dev/null
+++ b/apps/contacts/ajax/categories/rescan.php
@@ -0,0 +1,49 @@
+<?php
+/**
+ * Copyright (c) 2012 Thomas Tanghus <thomas@tanghus.net>
+ * This file is licensed under the Affero General Public License version 3 or
+ * later.
+ * See the COPYING-README file.
+ */
+
+require_once('../../../../lib/base.php');
+OC_JSON::checkLoggedIn();
+OC_JSON::checkAppEnabled('contacts');
+
+foreach ($_POST as $key=>$element) {
+	debug('_POST: '.$key.'=>'.print_r($element, true));
+}
+
+function bailOut($msg) {
+	OC_JSON::error(array('data' => array('message' => $msg)));
+	OC_Log::write('contacts','ajax/categories/rescan.php: '.$msg, OC_Log::DEBUG);
+	exit();
+}
+function debug($msg) {
+	OC_Log::write('contacts','ajax/categories/rescan.php: '.$msg, OC_Log::DEBUG);
+}
+
+$addressbooks = OC_Contacts_Addressbook::all(OC_User::getUser());
+if(count($addressbooks) == 0) {
+	bailOut(OC_Contacts_App::$l10n->t('No address books found.'));
+}
+$addressbookids = array();
+foreach($addressbooks as $addressbook) {
+	$addressbookids[] = $addressbook['id'];
+} 
+$contacts = OC_Contacts_VCard::all($addressbookids);
+if(count($contacts) == 0) {
+	bailOut(OC_Contacts_App::$l10n->t('No contacts found.'));
+}
+
+$cards = array();
+foreach($contacts as $contact) {
+	$cards[] = $contact['carddata'];
+} 
+
+OC_Contacts_App::$categories->rescan($cards);
+$categories = OC_Contacts_App::$categories->categories();
+
+OC_JSON::success(array('data' => array('categories'=>$categories)));
+
+?>