diff --git a/libc/kernel/uapi/linux/rtnetlink.h b/libc/kernel/uapi/linux/rtnetlink.h
index 335a5e9..22f8f1c 100644
--- a/libc/kernel/uapi/linux/rtnetlink.h
+++ b/libc/kernel/uapi/linux/rtnetlink.h
@@ -239,6 +239,7 @@
 #define RTM_F_FIB_MATCH 0x2000
 #define RTM_F_OFFLOAD 0x4000
 #define RTM_F_TRAP 0x8000
+#define RTM_F_OFFLOAD_FAILED 0x20000000
 enum rt_class_t {
   RT_TABLE_UNSPEC = 0,
   RT_TABLE_COMPAT = 252,