diff --git a/core/device/rwbased/endpoint.go b/core/device/rwbased/endpoint.go
index c9e4373..6322bce 100755
--- a/core/device/rwbased/endpoint.go
+++ b/core/device/rwbased/endpoint.go
@@ -95,7 +95,7 @@ func (e *Endpoint) WritePacket(_ stack.RouteInfo, _ tcpip.NetworkProtocolNumber,
 }
 
 // WritePackets writes packets back into io.ReadWriter.
-func (e *Endpoint) WritePackets(_ stack.RouteInfo, pkts stack.PacketBufferList, _ tcpip.NetworkProtocolNumber) (int, tcpip.Error) {
+func (e *Endpoint) WritePackets(pkts stack.PacketBufferList) (int, tcpip.Error) {
 	n := 0
 	for pkt := pkts.Front(); pkt != nil; pkt = pkt.Next() {
 		if err := e.writePacket(pkt); err != nil {