diff --git a/lib/php/src/Thrift.php b/lib/php/src/Thrift.php
index 8a25611..1e8f3fb 100644
--- a/lib/php/src/Thrift.php
+++ b/lib/php/src/Thrift.php
@@ -1,9 +1,5 @@
 <?php
 
-if (!defined('THRIFT_ROOT')) {
-  define('THRIFT_ROOT', dirname(__FILE__));
-}
-
-include_once THRIFT_ROOT.'/protocol/TProtocol.php';
+include_once PREFIX.'thrift/protocol/TProtocol.php';
 
 ?>