diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index f575939..c4c6c12 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -541,6 +541,7 @@
 	u64 bytes_used;
 	u64 bytes_pinned;
 	u64 bytes_reserved;
+	u64 bytes_readonly;
 	int full;
 	int force_alloc;
 	struct list_head list;