diff --git a/core/modules/node/lib/Drupal/node/Plugin/views/argument_default/Node.php b/core/modules/node/lib/Drupal/node/Plugin/views/argument_default/Node.php
index 9e53ee8..f35eb9e 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/views/argument_default/Node.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/views/argument_default/Node.php
@@ -24,7 +24,7 @@
  */
 class Node extends ArgumentDefaultPluginBase {
 
-  function get_argument() {
+  public function getArgument() {
     foreach (range(1, 3) as $i) {
       $node = menu_get_object('node', $i);
       if (!empty($node)) {
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_default/Tid.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_default/Tid.php
index 5e95072..4771782 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_default/Tid.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/argument_default/Tid.php
@@ -117,7 +117,7 @@ public function submitOptionsForm(&$form, &$form_state, &$options = array()) {
     $options['vids'] = array_filter($options['vids']);
   }
 
-  function get_argument() {
+  public function getArgument() {
     // Load default argument from taxonomy page.
     if (!empty($this->options['term_page'])) {
       if (arg(0) == 'taxonomy' && arg(1) == 'term' && is_numeric(arg(2))) {
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/CurrentUser.php b/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/CurrentUser.php
index 4d27b49..8ed758e 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/CurrentUser.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/CurrentUser.php
@@ -24,7 +24,7 @@
  */
 class CurrentUser extends ArgumentDefaultPluginBase {
 
-  function get_argument() {
+  public function getArgument() {
     global $user;
     return $user->uid;
   }
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/User.php b/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/User.php
index 360ec9d..45c4c2a 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/User.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/argument_default/User.php
@@ -37,7 +37,7 @@ public function buildOptionsForm(&$form, &$form_state) {
     );
   }
 
-  function get_argument() {
+  public function getArgument() {
     foreach (range(1, 3) as $i) {
       $user = menu_get_object('user', $i);
       if (!empty($user)) {
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 cb236d9..36eed67 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
@@ -744,7 +744,7 @@ function hasDefaultArgument() {
   public function getDefaultArgument() {
     $plugin = $this->getPlugin('argument_default');
     if ($plugin) {
-      return $plugin->get_argument();
+      return $plugin->getArgument();
     }
   }
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/ArgumentDefaultPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/ArgumentDefaultPluginBase.php
index 1df2774..0065815 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/ArgumentDefaultPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/ArgumentDefaultPluginBase.php
@@ -34,7 +34,7 @@
    *
    * This needs to be overridden by every default argument handler to properly do what is needed.
    */
-  function get_argument() { }
+  public function getArgument() { }
 
   /**
    * Sets the parent argument this plugin is associated with.
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Fixed.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Fixed.php
index fcdda9d..d825dc7 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Fixed.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Fixed.php
@@ -41,7 +41,7 @@ public function buildOptionsForm(&$form, &$form_state) {
   /**
    * Return the default argument.
    */
-  function get_argument() {
+  public function getArgument() {
     return $this->options['argument'];
   }
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Php.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Php.php
index eaa8d76..2fc8c38 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Php.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Php.php
@@ -50,7 +50,7 @@ public function access() {
     return user_access('use PHP for settings');
   }
 
-  function get_argument() {
+  public function getArgument() {
     // set up variables to make it easier to reference during the argument.
     $view = &$this->view;
     $argument = &$this->argument;
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Raw.php b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Raw.php
index a2a6290..25daa42 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Raw.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/argument_default/Raw.php
@@ -49,7 +49,7 @@ public function buildOptionsForm(&$form, &$form_state) {
     );
   }
 
-  function get_argument() {
+  public function getArgument() {
     $path = NULL;
     if ($this->options['use_alias']) {
       $path = drupal_get_path_alias();
diff --git a/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/argument_default/ArgumentDefaultTest.php b/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/argument_default/ArgumentDefaultTest.php
index ba706bb..c21da95 100644
--- a/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/argument_default/ArgumentDefaultTest.php
+++ b/core/modules/views/tests/views_test_data/lib/Drupal/views_test_data/Plugin/views/argument_default/ArgumentDefaultTest.php
@@ -32,9 +32,9 @@ protected function defineOptions() {
   }
 
   /**
-   * Overrides Drupal\views\Plugin\views\argument_default\ArgumentDefaultPluginBase::get_argument().
+   * {@inheritdoc}
    */
-  public function get_argument() {
+  public function getArgument() {
     return $this->options['value'];
   }