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 3d22d7d..6014a84 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
@@ -741,7 +741,7 @@ function has_default_argument() {
   /**
    * Get a default argument, if available.
    */
-  function getDefaultArgument() {
+  public function getDefaultArgument() {
     $plugin = $this->get_plugin('argument_default');
     if ($plugin) {
       return $plugin->get_argument();