diff --git a/network/tcp_msg.go b/network/tcp_msg.go
index db06d4a..b47a451 100644
--- a/network/tcp_msg.go
+++ b/network/tcp_msg.go
@@ -89,7 +89,7 @@ func (p *MsgParser) Read(conn *TCPConn) ([]byte, error) {
 			msgLen = binary.BigEndian.Uint32(bufMsgLen)
 		}
 	}
-	msgLen -= 2
+
 
 	// check len
 	if msgLen > p.maxMsgLen {
@@ -97,7 +97,8 @@ func (p *MsgParser) Read(conn *TCPConn) ([]byte, error) {
 	} else if msgLen < p.minMsgLen {
 		return nil, errors.New("message too short")
 	}
-
+	
+	msgLen -= 2
 	// data
 	msgData := make([]byte, msgLen)
 	if _, err := io.ReadFull(conn, msgData); err != nil {