diff --git a/sys/netinet/in_proto.c b/sys/netinet/in_proto.c
index 2827c221e6e..d2a772f46c7 100644
--- a/sys/netinet/in_proto.c
+++ b/sys/netinet/in_proto.c
@@ -106,6 +106,8 @@ static struct pr_usrreqs nousrreqs;
 #include <net/if_pfsync.h>
 #endif
 
+FEATURE(inet, "Internet Protocol version 4");
+
 extern	struct domain inetdomain;
 
 /* Spacer for loadable protocols. */
diff --git a/sys/netinet6/in6_proto.c b/sys/netinet6/in6_proto.c
index acd156950fe..ab54755f02c 100644
--- a/sys/netinet6/in6_proto.c
+++ b/sys/netinet6/in6_proto.c
@@ -133,6 +133,7 @@ __FBSDID("$FreeBSD$");
 /*
  * TCP/IP protocol family: IP6, ICMP6, UDP, TCP.
  */
+FEATURE(inet6, "Internet Protocol version 6");
 
 extern	struct domain inet6domain;
 static	struct pr_usrreqs nousrreqs;