@@ -573,7 +573,7 @@ func (a *Driver) aufsMount(ro []string, rw, target, mountLabel string) (err erro

 	offset := 54

 	if useDirperm() {

-		offset += len("dirperm1")

+		offset += len(",dirperm1")

 	}

 	b := make([]byte, syscall.Getpagesize()-len(mountLabel)-offset) // room for xino & mountLabel

 	bp := copy(b, fmt.Sprintf("br:%s=rw", rw))