diff --git a/libc/kernel/uapi/linux/ipv6.h b/libc/kernel/uapi/linux/ipv6.h
index 14c818c..b3db9ce 100644
--- a/libc/kernel/uapi/linux/ipv6.h
+++ b/libc/kernel/uapi/linux/ipv6.h
@@ -147,6 +147,7 @@
   DEVCONF_IOAM6_ENABLED,
   DEVCONF_IOAM6_ID,
   DEVCONF_IOAM6_ID_WIDE,
+  DEVCONF_NDISC_EVICT_NOCARRIER,
   DEVCONF_MAX
 };
 #endif