diff --git a/transport/gun/gun.go b/transport/gun/gun.go
index ae2ea6a46..0e5d2321f 100644
--- a/transport/gun/gun.go
+++ b/transport/gun/gun.go
@@ -147,6 +147,7 @@ func (g *Conn) WriteBuffer(buffer *buf.Buffer) error {
 	dataLen := buffer.Len()
 	varLen := UVarintLen(uint64(dataLen))
 	header := buffer.ExtendHeader(6 + varLen)
+	_ = header[6] // bounds check hint to compiler
 	header[0] = 0x00
 	binary.BigEndian.PutUint32(header[1:5], uint32(1+varLen+dataLen))
 	header[5] = 0x0A
diff --git a/transport/vmess/websocket.go b/transport/vmess/websocket.go
index 5fcaa0b89..179da886b 100644
--- a/transport/vmess/websocket.go
+++ b/transport/vmess/websocket.go
@@ -107,6 +107,7 @@ func (wsc *websocketConn) WriteBuffer(buffer *buf.Buffer) error {
 	headerLen += 4 // MASK KEY
 
 	header := buffer.ExtendHeader(headerLen)
+	_ = header[2] // bounds check hint to compiler
 	header[0] = websocket.BinaryMessage | 1<<7
 	header[1] = 1 << 7