diff --git a/libc/kernel/uapi/linux/mii.h b/libc/kernel/uapi/linux/mii.h
index aa4824d..5c87990 100644
--- a/libc/kernel/uapi/linux/mii.h
+++ b/libc/kernel/uapi/linux/mii.h
@@ -122,6 +122,7 @@
 #define ADVERTISE_1000HALF 0x0100
 #define CTL1000_AS_MASTER 0x0800
 #define CTL1000_ENABLE_MASTER 0x1000
+#define LPA_1000MSFAIL 0x8000
 #define LPA_1000LOCALRXOK 0x2000
 #define LPA_1000REMRXOK 0x1000
 #define LPA_1000FULL 0x0800