diff --git a/phpgwapi/inc/class.contacts.inc.php b/phpgwapi/inc/class.contacts.inc.php
index 4ca7751652..abbfecfedd 100644
--- a/phpgwapi/inc/class.contacts.inc.php
+++ b/phpgwapi/inc/class.contacts.inc.php
@@ -1,4 +1,4 @@
 <?php
   if (!$phpgw_info["server"]["contacts_application"]) { $phpgw_info["server"]["contacts_application"] = "addressbook"; }
-  include($phpgw_info["server"]["include_root"]."/".$phpgw_info["server"]["contacts_application"]."/inc/class.contacts.inc.php");
+  include(PHPGW_INCLUDE_ROOT."/".$phpgw_info["server"]["contacts_application"]."/inc/class.contacts.inc.php");
 ?>