diff --git a/main.go b/main.go
index ba8494eae..9ac2ee4aa 100644
--- a/main.go
+++ b/main.go
@@ -197,7 +197,7 @@ func handleConn(c net.Conn) {
 		s := "--------------------------------------"
 		printData := hex.EncodeToString([]byte(s))
 		lenData := int64(len(str) + len(const1) + len(orderNo) + len(printInit) + len(voice) + 1 + 2 + len(printData))
-		x1, x2 := int2h8l8(lenData)
+		x1, x2 := int2h8l8(lenData / 2)
 		data := str + x1 + x2 + const1 + orderNo + printInit + voice + begin + printData + check
 		c.Write([]byte(data))
 		fmt.Println("write data: ", data)