diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 7729981..23032d9 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -399,6 +399,7 @@
 	NET_IPV4_CONF_FORCE_IGMP_VERSION=17,
 	NET_IPV4_CONF_ARP_ANNOUNCE=18,
 	NET_IPV4_CONF_ARP_IGNORE=19,
+	NET_IPV4_CONF_PROMOTE_SECONDARIES=20,
 	__NET_IPV4_CONF_MAX
 };