diff --git a/lib/cocoa/src/protocol/TProtocol.h b/lib/cocoa/src/protocol/TProtocol.h
index 126f5df..cc8cdb4 100644
--- a/lib/cocoa/src/protocol/TProtocol.h
+++ b/lib/cocoa/src/protocol/TProtocol.h
@@ -25,7 +25,8 @@
 enum {
   TMessageType_CALL = 1,
   TMessageType_REPLY = 2,
-  TMessageType_EXCEPTION = 3
+  TMessageType_EXCEPTION = 3,
+  TMessageType_ONEWAY = 4
 };
 
 enum {