diff -u b/core/modules/views/lib/Drupal/views/Plugin/views/pager/PagerPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/pager/PagerPluginBase.php
--- b/core/modules/views/lib/Drupal/views/Plugin/views/pager/PagerPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/pager/PagerPluginBase.php
@@ -77,7 +77,7 @@
    *
    * This is mostly used for things that will override the value.
    */
-  protected function setItemsPerPage($items) {
+  public function setItemsPerPage($items) {
     $this->options['items_per_page'] = $items;
   }