diff --git a/libc/kernel/uapi/linux/fscrypt.h b/libc/kernel/uapi/linux/fscrypt.h
index 6079549..9a53f4c 100644
--- a/libc/kernel/uapi/linux/fscrypt.h
+++ b/libc/kernel/uapi/linux/fscrypt.h
@@ -48,7 +48,8 @@
   __u8 contents_encryption_mode;
   __u8 filenames_encryption_mode;
   __u8 flags;
-  __u8 __reserved[4];
+  __u8 log2_data_unit_size;
+  __u8 __reserved[3];
   __u8 master_key_identifier[FSCRYPT_KEY_IDENTIFIER_SIZE];
 };
 struct fscrypt_get_policy_ex_arg {