diff --git a/net/lib.c b/net/lib.c
index d4343bc..d2b3313 100644
--- a/net/lib.c
+++ b/net/lib.c
@@ -28,13 +28,13 @@
 #include <net.h>
 #include <linux/ctype.h>
 
-int string_to_ethaddr(const char *str, u8 enetaddr[6])
+int string_to_ethaddr(const char *str, u8 enetaddr[ETH_ALEN])
 {
 	int reg;
 	char *e;
 
 	if (!str || strlen(str) != 17) {
-		memset(enetaddr, 0, 6);
+		memset(enetaddr, 0, ETH_ALEN);
 		return -EINVAL;
 	}
 
@@ -42,7 +42,7 @@
 			str[11] != ':' || str[14] != ':')
 		return -EINVAL;
 
-	for (reg = 0; reg < 6; ++reg) {
+	for (reg = 0; reg < ETH_ALEN; ++reg) {
 		enetaddr[reg] = simple_strtoul(str, &e, 16);
 		str = e + 1;
 	}
@@ -50,7 +50,7 @@
 	return 0;
 }
 
-void ethaddr_to_string(const u8 enetaddr[6], char *str)
+void ethaddr_to_string(const u8 enetaddr[ETH_ALEN], char *str)
 {
 	sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x",
 		 enetaddr[0], enetaddr[1], enetaddr[2], enetaddr[3],