diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 4621ddd..b99e841 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -162,7 +162,7 @@ function forum_menu() {
  * Implements hook_menu_local_tasks().
  */
 function forum_menu_local_tasks(&$data, $router_item, $root_path) {
-  global $user;
+  $user = Drupal::request()->attributes->get('_account');
 
   // Add action link to 'node/add/forum' on 'forum' sub-pages.
   if ($root_path == 'forum' || $root_path == 'forum/%') {
@@ -822,7 +822,8 @@ function _forum_topics_unread($term, $uid) {
  *   A list of all the topics in a forum.
  */
 function forum_get_topics($tid, $sortby, $forum_per_page) {
-  global $user, $forum_topic_list_header;
+  global $forum_topic_list_header;
+  $user = Drupal::request()->attributes->get('_account');
 
   $forum_topic_list_header = array(
     array('data' => t('Topic'), 'field' => 'f.title'),
@@ -1038,7 +1039,7 @@ function template_preprocess_forums(&$variables) {
  *   - tid: Taxonomy term ID of the current forum.
  */
 function template_preprocess_forum_list(&$variables) {
-  global $user;
+  $user = Drupal::request()->attributes->get('_account');
   $row = 0;
   // Sanitize each forum so that the template can safely print the data.
   foreach ($variables['forums'] as $id => $forum) {
@@ -1231,7 +1232,7 @@ function template_preprocess_forum_submitted(&$variables) {
  *   previously viewed the node; otherwise HISTORY_READ_LIMIT.
  */
 function _forum_user_last_visit($nid) {
-  global $user;
+  $user = Drupal::request()->attributes->get('_account');
   $history = &drupal_static(__FUNCTION__, array());
 
   if (empty($history)) {