diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index c4a695a..9e2c261 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -78,4 +78,5 @@
 int btrfs_releasepage(struct page *page, gfp_t flags);
 void btrfs_btree_balance_dirty(struct btrfs_root *root);
 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root);
+void btrfs_mark_buffer_dirty(struct buffer_head *bh);
 #endif