diff --git a/def.go b/def.go
index 7ce5fab..1db0463 100644
--- a/def.go
+++ b/def.go
@@ -45,10 +45,6 @@ type MQKeepAlive struct {
 	Date       time.Time `json:"date"`
 }
 
-type CallbackMsgData struct {
-	Data `json:"data"`
-}
-
 const (
 	commandForwardMsg   = 1
 	commandReplyMsg     = 2