diff --git a/include/kvm/uip.h b/include/kvm/uip.h
index bded986..4497f6a 100644
--- a/include/kvm/uip.h
+++ b/include/kvm/uip.h
@@ -19,6 +19,7 @@
 #define UIP_IP_TTL		0X40
 #define UIP_IP_P_UDP		0X11
 #define UIP_IP_P_TCP		0X06
+#define UIP_IP_P_ICMP		0X01
 
 #define UIP_TCP_HDR_LEN		0x50
 #define UIP_TCP_WIN_SIZE	14600
diff --git a/net/uip/ipv4.c b/net/uip/ipv4.c
index 4def129..58373fd 100644
--- a/net/uip/ipv4.c
+++ b/net/uip/ipv4.c
@@ -12,13 +12,13 @@ int uip_tx_do_ipv4(struct uip_tx_arg *arg)
 	}
 
 	switch (ip->proto) {
-	case 0x01: /* ICMP */
+	case UIP_IP_P_ICMP:
 		uip_tx_do_ipv4_icmp(arg);
 		break;
-	case 0x06: /* TCP */
+	case UIP_IP_P_TCP:
 		uip_tx_do_ipv4_tcp(arg);
 		break;
-	case 0x11: /* UDP */
+	case UIP_IP_P_UDP:
 		uip_tx_do_ipv4_udp(arg);
 		break;
 	default: