diff --git a/include/linux/in6.h b/include/linux/in6.h
index 097a34b..5c83d9e 100644
--- a/include/linux/in6.h
+++ b/include/linux/in6.h
@@ -271,6 +271,7 @@
 #define IPV6_ORIGDSTADDR        74
 #define IPV6_RECVORIGDSTADDR    IPV6_ORIGDSTADDR
 #define IPV6_TRANSPARENT        75
+#define IPV6_UNICAST_IF         76
 
 /*
  * Multicast Routing: