diff --git a/core/themes/bartik/bartik.theme b/core/themes/bartik/bartik.theme
index 2503303f402267fed999f907cb099a5fdfa114e2..836a8f72df4a7566a4566bbf6ac3e5d5f57feea5 100644
--- a/core/themes/bartik/bartik.theme
+++ b/core/themes/bartik/bartik.theme
@@ -159,7 +159,7 @@ function bartik_menu_tree__shortcut_default($variables) {
 function bartik_preprocess_field(&$variables) {
   $element = $variables['element'];
   if ($element['#field_type'] == 'taxonomy_term_reference') {
-    $variables['title_attributes']['class'][] = array('field-label');
+    $variables['title_attributes']['class'][] = 'field-label';
     if ($variables['element']['#label_display'] == 'inline') {
       $variables['title_attributes']['class'][] = 'inline';
     }
diff --git a/core/themes/bartik/templates/field--taxonomy-term-reference.html.twig b/core/themes/bartik/templates/field--taxonomy-term-reference.html.twig
index 1f05c3e30fb7bc537d0d200bc3af404040946d85..840f9941a04b634254038064fbfd87c3290ed1bc 100644
--- a/core/themes/bartik/templates/field--taxonomy-term-reference.html.twig
+++ b/core/themes/bartik/templates/field--taxonomy-term-reference.html.twig
@@ -6,7 +6,7 @@
  * Available variables:
  * - attributes: HTML attributes for the containing element.
  * - label_hidden: Whether the field label has been set to hidden.
- * - label_attributes: HTML attributes for the label.
+ * - title_attributes: HTML attributes for the label.
  * - label: The label for the field.
  * - content_attributes: HTML attributes for the content.
  * - items: List of all the field items.
@@ -18,7 +18,7 @@
 #}
 <div class="{{ attributes.class }} clearfix"{{ attributes|without('class') }}>
   {% if not label_hidden %}
-    <h3{{ label_attributes }}>{{ label }}: </h3>
+    <h3{{ title_attributes }}>{{ label }}: </h3>
   {% endif %}
   <ul class="links">
     {% for delta, item in items %}