diff --git a/lib/php/src/Thrift.php b/lib/php/src/Thrift.php
index dd1e0d7..ef6ab8a 100644
--- a/lib/php/src/Thrift.php
+++ b/lib/php/src/Thrift.php
@@ -51,6 +51,7 @@
   const CALL  = 1;
   const REPLY = 2;
   const EXCEPTION = 3;
+  const ONEWAY = 4;
 }
 
 /**