diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php
index 32b21f3..a7c04a5 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument/ArgumentPluginBase.php
@@ -726,7 +726,7 @@ public function defaultEmpty() {
    * This just returns true. The view argument builder will know where
    * to find the argument from.
    */
-  public function defaultDefault() {
+  protected function defaultDefault() {
     return TRUE;
   }