diff --git a/libc/kernel/uapi/linux/nfs4.h b/libc/kernel/uapi/linux/nfs4.h
index e6118a6..bc3e002 100644
--- a/libc/kernel/uapi/linux/nfs4.h
+++ b/libc/kernel/uapi/linux/nfs4.h
@@ -35,6 +35,9 @@
 #define NFS4_ACCESS_EXTEND 0x0008
 #define NFS4_ACCESS_DELETE 0x0010
 #define NFS4_ACCESS_EXECUTE 0x0020
+#define NFS4_ACCESS_XAREAD 0x0040
+#define NFS4_ACCESS_XAWRITE 0x0080
+#define NFS4_ACCESS_XALIST 0x0100
 #define NFS4_FH_PERSISTENT 0x0000
 #define NFS4_FH_NOEXPIRE_WITH_OPEN 0x0001
 #define NFS4_FH_VOLATILE_ANY 0x0002