diff --git a/backend/box/box.go b/backend/box/box.go
index 58b3c8637..0f2d2f41f 100644
--- a/backend/box/box.go
+++ b/backend/box/box.go
@@ -960,6 +960,7 @@ func (o *Object) Open(options ...fs.OpenOption) (in io.ReadCloser, err error) {
 	if o.id == "" {
 		return nil, errors.New("can't download - no id")
 	}
+	fs.FixRangeOption(options, o.size)
 	var resp *http.Response
 	opts := rest.Opts{
 		Method:  "GET",