copypasta omm nom

includes/regenerate_derivatives.form.inc

@@ -118,7 +118,7 @@ function islandora_regenerate_object_derivatives_batch(AbstractObject $object) {
  */
 function islandora_regenerate_datastream_derivative_batch(AbstractDatastream $datastream) {
   module_load_include('inc', 'islandora', 'includes/derivatives');
-  islandora_remove_defer_derivatives_flag($object);
+  islandora_remove_defer_derivatives_flag($datastream->parent);
   return array(
     'title' => t('Regenerating derivatives for the @dsid datastream', array('@dsid' => $datastream->id)),
     'operations' => islandora_do_batch_derivatives($datastream->parent, array(