diff --git a/protocol/base/base.go b/protocol/base/base.go
index f3d6b42..3fbd3c2 100644
--- a/protocol/base/base.go
+++ b/protocol/base/base.go
@@ -14,6 +14,7 @@ type IncomingMessage interface {
 	IncomingMessage() IncomingMessage
 	Self() IncomingMessage
 	SetSelf(self IncomingMessage)
+	Original() []byte
 	Kind() int
 	msgpack.CustomDecoder
 }