diff --git a/libc/kernel/uapi/linux/btrfs.h b/libc/kernel/uapi/linux/btrfs.h
index cfeef2a..c0a586c 100644
--- a/libc/kernel/uapi/linux/btrfs.h
+++ b/libc/kernel/uapi/linux/btrfs.h
@@ -187,6 +187,7 @@
 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES (1ULL << 9)
 #define BTRFS_FEATURE_INCOMPAT_METADATA_UUID (1ULL << 10)
 #define BTRFS_FEATURE_INCOMPAT_RAID1C34 (1ULL << 11)
+#define BTRFS_FEATURE_INCOMPAT_ZONED (1ULL << 12)
 struct btrfs_ioctl_feature_flags {
   __u64 compat_flags;
   __u64 compat_ro_flags;