diff --git a/lib/php/src/Thrift.php b/lib/php/src/Thrift.php
index d2a9441..c845395 100644
--- a/lib/php/src/Thrift.php
+++ b/lib/php/src/Thrift.php
@@ -785,3 +785,5 @@
 }
 include_once $GLOBALS['THRIFT_ROOT'].'/protocol/TProtocol.php';
 include_once $GLOBALS['THRIFT_ROOT'].'/transport/TTransport.php';
+include_once $GLOBALS['THRIFT_ROOT'].'/TStringUtils.php';
+