diff --git a/src/include/lwip/sockets.h b/src/include/lwip/sockets.h
index e2a36a46..8bbebb84 100644
--- a/src/include/lwip/sockets.h
+++ b/src/include/lwip/sockets.h
@@ -192,7 +192,7 @@ struct linger {
 #define PF_UNSPEC       AF_UNSPEC
 
 #define IPPROTO_IP      0
-#define IPPROTO_ICMP    1 
+#define IPPROTO_ICMP    1
 #define IPPROTO_TCP     6
 #define IPPROTO_UDP     17
 #if LWIP_IPV6
@@ -200,6 +200,7 @@ struct linger {
 #define IPPROTO_ICMPV6  58
 #endif /* LWIP_IPV6 */
 #define IPPROTO_UDPLITE 136
+#define IPPROTO_RAW     255
 
 /* Flags we can use with send and recv. */
 #define MSG_PEEK       0x01    /* Peeks at an incoming message */