diff --git a/include/netinet/in.h b/include/netinet/in.h
index c240634d200..40813671738 100644
--- a/include/netinet/in.h
+++ b/include/netinet/in.h
@@ -58,6 +58,7 @@
 #define IPPROTO_ESP           50   /* Encapsulation Security Payload protocol */
 #define IPPROTO_AH            51   /* Authentication Header protocol */
 #define IPPROTO_ICMP6         58   /* Internal Control Message Protocol v6 */
+#define IPPROTO_ICMPV6        IPPROTO_ICMP6
 #define IPPROTO_NONE          59   /* IPv6 no next header. */
 #define IPPROTO_DSTOPTS       60   /* IPv6 destination options. */
 #define IPPROTO_MTP           92   /* Multicast Transport Protocol.  */