diff --git a/lib/php/src/Thrift.php b/lib/php/src/Thrift.php
index a14a3f3..d2a9441 100644
--- a/lib/php/src/Thrift.php
+++ b/lib/php/src/Thrift.php
@@ -747,6 +747,8 @@
   const WRONG_METHOD_NAME = 3;
   const BAD_SEQUENCE_ID = 4;
   const MISSING_RESULT = 5;
+  const INTERNAL_ERROR = 6;
+  const PROTOCOL_ERROR = 7;
 
   function __construct($message=null, $code=0) {
     parent::__construct($message, $code);