diff --git a/libc/kernel/uapi/linux/neighbour.h b/libc/kernel/uapi/linux/neighbour.h
index cf32a12..6329211 100644
--- a/libc/kernel/uapi/linux/neighbour.h
+++ b/libc/kernel/uapi/linux/neighbour.h
@@ -51,6 +51,7 @@
 #define NTF_PROXY 0x08
 #define NTF_EXT_LEARNED 0x10
 #define NTF_OFFLOADED 0x20
+#define NTF_STICKY 0x40
 #define NTF_ROUTER 0x80
 #define NUD_INCOMPLETE 0x01
 #define NUD_REACHABLE 0x02