diff --git a/lib/py/src/Thrift.py b/lib/py/src/Thrift.py
index 601b41c..21d7aa4 100644
--- a/lib/py/src/Thrift.py
+++ b/lib/py/src/Thrift.py
@@ -40,6 +40,7 @@
   CALL  = 1
   REPLY = 2
   EXCEPTION = 3
+  ONEWAY = 4
 
 class TProcessor: