diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 66196ef..a518c13 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2316,7 +2316,6 @@ function template_preprocess_item_list(&$variables) {
   // Prepare for adding classes to each item.
   $num_items = count($variables['items']);
   $i = 0;
-
   foreach ($variables['items'] as &$item) {
     $i++;
     $attributes = array();
@@ -2357,7 +2356,7 @@ function template_preprocess_item_list(&$variables) {
     }
     else {
       // Turn the item into an array if it wasn't one already.
-      $item = array('data' => $item);
+      $item = array('#markup' => $item);
     }
 
     // @todo remove after http://drupal.org/node/1649780 lands.
diff --git a/core/modules/system/templates/item-list.html.twig b/core/modules/system/templates/item-list.html.twig
index e635f3a..385140f 100644
--- a/core/modules/system/templates/item-list.html.twig
+++ b/core/modules/system/templates/item-list.html.twig
@@ -23,18 +23,21 @@
  * @see http://drupal.org/node/1842140 To remove heading tag and div
  */
 #}
-{% if items %}
-  {% spaceless %}
-  <div class="item-list">
-    {% if title is not empty -%}
-      <h3>{{ title }}</h3>
-    {%- endif %}
-    <{{ tag }}{{ attributes }}>
-      {% for item in items -%}
-        {% set value = item.data ? item.data : item -%}
-        <li{{ item['#wrapper_attributes'] }}>{{ value }}</li>
-      {%- endfor -%}
-    </{{ tag }}>
-  </div>
-  {% endspaceless %}
+{% if items is not empty %}
+{% spaceless %}
+<div class="item-list">
+  {% if title is not empty -%}
+    <h3>{{ title }}</h3>
+  {%- endif %}
+  <{{ tag }}{{ attributes }}>
+    {% for item in items -%}
+      {#
+        We usually don't do this, but here we target a specific render element
+        property--#wrapper_attributes.
+      #}
+      <li{{ item['#wrapper_attributes'] }}>{{ item }}</li>
+    {%- endfor -%}
+  </{{ tag }}>
+</div>
+{% endspaceless %}
 {% endif %}