diff --git a/protocol/naive/inbound_conn.go b/protocol/naive/inbound_conn.go
index 1dbb2bd8..0711b637 100644
--- a/protocol/naive/inbound_conn.go
+++ b/protocol/naive/inbound_conn.go
@@ -95,6 +95,7 @@ func (p *paddingConn) writeWithPadding(writer io.Writer, data []byte) (n int, er
 		binary.BigEndian.PutUint16(header, uint16(len(data)))
 		header[2] = byte(paddingSize)
 		common.Must1(buffer.Write(data))
+		buffer.Extend(paddingSize)
 		_, err = writer.Write(buffer.Bytes())
 		if err == nil {
 			n = len(data)