Index: program/include/rcube_ldap.inc
===================================================================
--- program/include/rcube_ldap.inc	(revision 03b27176ef522cdf1cfbe44d426592ab86932781)
+++ program/include/rcube_ldap.inc	(revision 7e344087de3f151dda7618e950b43c23664776a3)
@@ -1,4 +1,3 @@
 <?php
-
 /*
  +-----------------------------------------------------------------------+
@@ -289,5 +288,5 @@
     // add general filter to query
     if (!empty($this->prop['filter']))
-      $filter = '(&'.$this->prop['filter'] . $filter . ')';
+      $filter = '(&('.$this->prop['filter'] .')' . $filter . ')';
 
     // set filter string and execute search