diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 187e09e..c9959af 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -513,6 +513,8 @@ function template_preprocess_datetime_wrapper(&$variables) {
     $variables['required'] = TRUE;
   }
   $variables['content'] = $element['#children'];
+
+  $variables['title_attributes'] = isset($variables['title_attributes']) ? new Attribute($variables['title_attributes']) : new Attribute();
 }
 
 /**