diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index c58069e..c236107 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -462,7 +462,11 @@ function seven_form_element_label($variables) {
   }
 
   // If the element is required, a required marker is appended to the label.
-  $required = !empty($element['#required']) ? theme('form_required_marker', array('element' => $element)) : '';
+  $marker = array(
+    '#theme' => 'form_required_marker',
+    '#element' => $element
+  );
+  $required = !empty($element['#required']) ? drupal_render($marker) : '';
 
   $title = Xss::filterAdmin($element['#title']);