diff --git a/handler_type.go b/handler_type.go
index 84f138c..6dd3832 100644
--- a/handler_type.go
+++ b/handler_type.go
@@ -3,7 +3,7 @@ package network
 import "git.hpds.cc/Component/network/frame"
 
 // AsyncHandler is the request-response mode (async)
-type AsyncHandler func([]byte) (byte, []byte)
+type AsyncHandler func([]byte) (frame.Tag, []byte)
 
 // PipeHandler is the bidirectional stream mode (blocking).
 type PipeHandler func(in <-chan []byte, out chan<- *frame.PayloadFrame)