diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 6fa05fb78189bb1b2479d5071f690ed00e22f8d2..aa46b75d75af5a517a6b23180c8b4a95b9d86fcb 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1503,7 +1503,8 @@ xfs_reflink_unshare(
 	if (error)
 		goto out;
 
-	error = filemap_write_and_wait_range(inode->i_mapping, offset, len);
+	error = filemap_write_and_wait_range(inode->i_mapping, offset,
+			offset + len - 1);
 	if (error)
 		goto out;