diff --git a/core/modules/field_ui/src/Element/FieldUiTable.php b/core/modules/field_ui/src/Element/FieldUiTable.php
index 8c80baa..1dd5e62 100644
--- a/core/modules/field_ui/src/Element/FieldUiTable.php
+++ b/core/modules/field_ui/src/Element/FieldUiTable.php
@@ -85,11 +85,12 @@ public static function tablePreRender($elements) {
           if ($depth = count($parents[$name])) {
             $children = Element::children($row);
             $cell = current($children);
-            $row[$cell]['#prefix'] = [
+            $indentation = [
               '#theme' => 'indentation',
               '#size' => $depth,
               '#suffix' => isset($row[$cell]['#prefix']) ? $row[$cell]['#prefix'] : '',
             ];
+            $row[$cell]['#prefix'] = \Drupal::service('renderer')->render($indentation);
           }
 
           // Add row id and associate JS settings.