diff --git a/plugins/kolab_addressbook/kolab_addressbook.php b/plugins/kolab_addressbook/kolab_addressbook.php
index 2ddf8db2..37178d0f 100644
--- a/plugins/kolab_addressbook/kolab_addressbook.php
+++ b/plugins/kolab_addressbook/kolab_addressbook.php
@@ -204,8 +204,9 @@ class kolab_addressbook extends rcube_plugin
         $jsdata = array();
         $sources = (array)$this->rc->get_address_sources();
 
-        // list all non-kolab sources first
-        foreach (array_filter($sources, function($source){ return empty($source['kolab']); }) as $j => $source) {
+        // list all non-kolab sources first (also exclude hidden sources)
+        $filter = function($source){ return empty($source['kolab']) && empty($source['hidden']); };
+        foreach (array_filter($sources, $filter)  as $j => $source) {
             $id = strval(strlen($source['id']) ? $source['id'] : $j);
             $out .= $this->addressbook_list_item($id, $source, $jsdata) . '</li>';
         }