--- ifenslave.c
+++ ifenslave.c
@@ -520,8 +520,8 @@ static int if_getconfig(char *ifname)
 	if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
 		return -1;
 	printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.\n",
-	       ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
-	       ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
+	       ifr.ifr_addr.sa_data[2] & 0xff, ifr.ifr_addr.sa_data[3] & 0xff,
+	       ifr.ifr_addr.sa_data[4] & 0xff, ifr.ifr_addr.sa_data[5] & 0xff);
 
 	strcpy(ifr.ifr_name, ifname);
 	if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)