diff --git a/fs/nilfs2/sufile.h b/fs/nilfs2/sufile.h
index c339ad5..4146a65 100644
--- a/fs/nilfs2/sufile.h
+++ b/fs/nilfs2/sufile.h
@@ -42,6 +42,7 @@
 				   struct buffer_head **);
 void nilfs_sufile_put_segment_usage(struct inode *, __u64,
 				    struct buffer_head *);
+int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
 int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
 ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
 				size_t);