diff --git a/core/modules/datetime/datetime.module b/core/modules/datetime/datetime.module
index 1f0c81e..458c971 100644
--- a/core/modules/datetime/datetime.module
+++ b/core/modules/datetime/datetime.module
@@ -270,10 +270,11 @@ function template_preprocess_datetime_wrapper(&$variables) {
   // If the element is required, a required marker is appended to the label.
   $variables['required'] = NULL;
   if(!empty($element['#required'])) {
-    $variables['required'] = array(
+    $required = array(
       '#theme' => 'form_required_marker',
       '#element' => $element,
     );
+    $variables['required'] = drupal_render($required);
   }
 
   if (!empty($element['#title'])) {