diff --git a/libc/kernel/uapi/linux/stat.h b/libc/kernel/uapi/linux/stat.h
index 9974f3e..ff98fd2 100644
--- a/libc/kernel/uapi/linux/stat.h
+++ b/libc/kernel/uapi/linux/stat.h
@@ -68,7 +68,8 @@
   __u64 stx_mnt_id;
   __u32 stx_dio_mem_align;
   __u32 stx_dio_offset_align;
-  __u64 __spare3[12];
+  __u64 stx_subvol;
+  __u64 __spare3[11];
 };
 #define STATX_TYPE 0x00000001U
 #define STATX_MODE 0x00000002U
@@ -86,6 +87,7 @@
 #define STATX_MNT_ID 0x00001000U
 #define STATX_DIOALIGN 0x00002000U
 #define STATX_MNT_ID_UNIQUE 0x00004000U
+#define STATX_SUBVOL 0x00008000U
 #define STATX__RESERVED 0x80000000U
 #define STATX_ALL 0x00000fffU
 #define STATX_ATTR_COMPRESSED 0x00000004