diff --git a/core/modules/taxonomy/taxonomy.admin.inc b/core/modules/taxonomy/taxonomy.admin.inc
index 5ca2345..875ccf7 100644
--- a/core/modules/taxonomy/taxonomy.admin.inc
+++ b/core/modules/taxonomy/taxonomy.admin.inc
@@ -241,8 +241,12 @@ function taxonomy_overview_terms($form, &$form_state, Vocabulary $vocabulary) {
   );
   foreach ($current_page as $key => $term) {
     $form['terms'][$key]['#term'] = $term;
+    $indentation =  array('#theme' => 'indentation');
+    if (isset($term->depth->value)) {
+      $indentation['#size'] = $term->depth->value;
+    }
     $form['terms'][$key]['term'] = array(
-      '#prefix' => isset($term->depth->value) && $term->depth->value > 0 ? theme('indentation', array('size' => $term->depth->value)) : '',
+      '#prefix' => isset($term->depth->value) && $term->depth->value > 0 ? drupal_render($indentation) : '',
       '#type' => 'link',
       '#title' => $term->label(),
       '#href' => "taxonomy/term/" . $term->id(),