diff --git a/transport/v2raygrpclite/conn.go b/transport/v2raygrpclite/conn.go
index 0cb7b810..7906fcdb 100644
--- a/transport/v2raygrpclite/conn.go
+++ b/transport/v2raygrpclite/conn.go
@@ -117,6 +117,7 @@ func (c *GunConn) WriteBuffer(buffer *buf.Buffer) error {
 	dataLen := buffer.Len()
 	varLen := rw.UVariantLen(uint64(dataLen))
 	header := buffer.ExtendHeader(6 + varLen)
+	header[0] = 0x00
 	binary.BigEndian.PutUint32(header[1:5], uint32(1+varLen+dataLen))
 	header[5] = 0x0A
 	binary.PutUvarint(header[6:], uint64(dataLen))