diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php
index e78516d..3453da0 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/query/QueryPluginBase.php
@@ -154,7 +154,7 @@ function set_where_group($type = 'AND', $group = NULL, $where = 'where') {
    * @param $type
    *   Either 'AND' or 'OR'
    */
-  function set_group_operator($type = 'AND') {
+  public function setGroupOperator($type = 'AND') {
     $this->group_operator = strtoupper($type);
   }
 
diff --git a/core/modules/views/lib/Drupal/views/ViewExecutable.php b/core/modules/views/lib/Drupal/views/ViewExecutable.php
index a8a8dd2..1ed0983 100644
--- a/core/modules/views/lib/Drupal/views/ViewExecutable.php
+++ b/core/modules/views/lib/Drupal/views/ViewExecutable.php
@@ -1039,7 +1039,7 @@ public function build($display_id = NULL) {
     if (!empty($this->filter)) {
       $filter_groups = $this->display_handler->getOption('filter_groups');
       if ($filter_groups) {
-        $this->query->set_group_operator($filter_groups['operator']);
+        $this->query->setGroupOperator($filter_groups['operator']);
         foreach ($filter_groups['groups'] as $id => $operator) {
           $this->query->set_where_group($operator, $id);
         }