diff -u b/core/includes/theme.inc b/core/includes/theme.inc
--- b/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -2223,23 +2223,20 @@
 }
 
 /**
- * Returns HTML for a marker for new or updated content.
+ * Prepares variables for mark templates.
  *
- * @param $variables
+ * Default template: mark.html.twig.
+ *
+ * @param array $variables
  *   An associative array containing:
  *   - type: Number representing the marker type to display. See MARK_NEW,
  *     MARK_UPDATED, MARK_READ.
  */
-function theme_mark($variables) {
-  $type = $variables['mark_type'];
+function template_preprocess_mark(&$variables) {
   global $user;
+  $variables['logged_in'] = FALSE;
   if ($user->uid) {
-    if ($type == MARK_NEW) {
-      return ' <span class="marker">' . t('new') . '</span>';
-    }
-    elseif ($type == MARK_UPDATED) {
-      return ' <span class="marker">' . t('updated') . '</span>';
-    }
+    $variables['logged_in'] = TRUE;
   }
 }
 
@@ -2272,20 +2269,23 @@
 }
 
 /**
- * Prepares variables for mark templates.
- *
- * Default template: mark.html.twig.
+ * Returns HTML for a marker for new or updated content.
  *
- * @param array $variables
+ * @param $variables
  *   An associative array containing:
  *   - type: Number representing the marker type to display. See MARK_NEW,
  *     MARK_UPDATED, MARK_READ.
  */
-function template_preprocess_mark(&$variables) {
+function theme_mark($variables) {
+  $type = $variables['type'];
   global $user;
-  $variables['logged_in'] = FALSE;
   if ($user->uid) {
-    $variables['logged_in'] = TRUE;
+    if ($type == MARK_NEW) {
+      return ' <span class="marker">' . t('new') . '</span>';
+    }
+    elseif ($type == MARK_UPDATED) {
+      return ' <span class="marker">' . t('updated') . '</span>';
+    }
   }
 }
 
@@ -3135,7 +3135,8 @@
       'template' => 'tablesort-indicator',
     ),
     'mark' => array(
-      'variables' => array('mark_type' => MARK_NEW),
+      'variables' => array('type' => MARK_NEW),
+      'template' => 'mark',
     ),
     'item_list' => array(
       'variables' => array('items' => array(), 'title' => '', 'type' => 'ul', 'attributes' => array()),
@@ -3177,7 +3178,6 @@
     ),
     'mark' => array(
       'variables' => array('type' => MARK_NEW),
-      'template' => 'mark',
     ),
     'item_list' => array(
       'variables' => array('items' => array(), 'title' => '', 'type' => 'ul', 'attributes' => array()),