diff --git a/libc/kernel/uapi/linux/ip.h b/libc/kernel/uapi/linux/ip.h
index 8632d45..564fd8d 100644
--- a/libc/kernel/uapi/linux/ip.h
+++ b/libc/kernel/uapi/linux/ip.h
@@ -145,6 +145,7 @@
   IPV4_DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN,
   IPV4_DEVCONF_DROP_UNICAST_IN_L2_MULTICAST,
   IPV4_DEVCONF_DROP_GRATUITOUS_ARP,
+  IPV4_DEVCONF_BC_FORWARDING,
   __IPV4_DEVCONF_MAX
 };
 #define IPV4_DEVCONF_MAX (__IPV4_DEVCONF_MAX - 1)