diff --git a/td.go b/td.go
index 7944b2c..d9545e0 100644
--- a/td.go
+++ b/td.go
@@ -296,10 +296,8 @@ func clientMsg(c *tdlib.Client, m TGCommand) {
 			MQCWMsgQueue <- r
 		}
 	case commandCallback:
-		p := tdlib.CallbackQueryPayloadData{
-			Data: m.CallbackData,
-		}
-		a, err := c.GetCallbackQueryAnswer(m.FromChatID64, m.FromMsgID64, p)
+		p := tdlib.NewCallbackQueryPayloadData(m.CallbackData)
+		a, err := c.GetCallbackQueryAnswer(m.FromChatID64, m.FromMsgID64, p.(tdlib.CallbackQueryPayload))
 		logOnError(err, "clientMsg : GetCallbackQueryAnswer")
 		b, _ := json.Marshal(a)
 		log.Printf("GetCallbackQueryAnswer :\n%s\n", string(b))