diff --git a/netcard.go b/netcard.go
index 61efa44..6822d29 100644
--- a/netcard.go
+++ b/netcard.go
@@ -149,7 +149,7 @@ func NewNetTunnel() *NetTunnel {
 	go func() {
 		for wbuf := range nt.writer {
 			var frame ethernet.Frame = wbuf
-			// copy(frame[0:6], nt.ifmac)
+			copy(frame[0:6], nt.ifmac)
 
 			// payload := frame.Payload()