diff --git a/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php b/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php
index 3f3f903..e3e0c1b 100644
--- a/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php
+++ b/core/modules/comment/lib/Drupal/comment/Plugin/views/field/NodeNewComments.php
@@ -53,7 +53,7 @@ public function buildOptionsForm(&$form, &$form_state) {
 
   public function query() {
     $this->ensureMyTable();
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
     $this->field_alias = $this->table . '_' . $this->field;
   }
 
diff --git a/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php b/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
index aa364ab..18899f6 100644
--- a/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
+++ b/core/modules/field/lib/Drupal/field/Plugin/views/field/Field.php
@@ -187,7 +187,7 @@ public function query($use_groupby = FALSE) {
     // Add additional fields (and the table join itself) if needed.
     if ($this->add_field_table($use_groupby)) {
       $this->ensureMyTable();
-      $this->add_additional_fields($fields);
+      $this->addAdditionalFields($fields);
 
       // Filter by langcode, if field translation is enabled.
       $field = $this->field_info;
diff --git a/core/modules/node/lib/Drupal/node/Plugin/views/field/Link.php b/core/modules/node/lib/Drupal/node/Plugin/views/field/Link.php
index 266bedf..f01a62f 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/views/field/Link.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/views/field/Link.php
@@ -42,7 +42,7 @@ public function buildOptionsForm(&$form, &$form_state) {
    * {@inheritdoc}
    */
   public function query() {
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
   }
 
   function render($values) {
diff --git a/core/modules/node/lib/Drupal/node/Plugin/views/field/Path.php b/core/modules/node/lib/Drupal/node/Plugin/views/field/Path.php
index 3e41bc7..7884163 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/views/field/Path.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/views/field/Path.php
@@ -50,7 +50,7 @@ public function buildOptionsForm(&$form, &$form_state) {
 
   public function query() {
     $this->ensureMyTable();
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
   }
 
   function render($values) {
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/LinkEdit.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/LinkEdit.php
index 64225c0..4428343 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/LinkEdit.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/LinkEdit.php
@@ -50,7 +50,7 @@ public function buildOptionsForm(&$form, &$form_state) {
 
   public function query() {
     $this->ensureMyTable();
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
   }
 
   function render($values) {
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php
index 5d48bce..db19774 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Plugin/views/field/TaxonomyIndexTid.php
@@ -88,7 +88,7 @@ public function buildOptionsForm(&$form, &$form_state) {
    * Add this term to the query
    */
   public function query() {
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
   }
 
   function pre_render(&$values) {
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/field/Link.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Link.php
index 39b2a9b..20f68e8 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/field/Link.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Link.php
@@ -53,7 +53,7 @@ public function access() {
 
   public function query() {
     $this->ensureMyTable();
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
   }
 
   /**
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
index 7aa22fe..3095772 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Permissions.php
@@ -31,7 +31,7 @@ public function init(ViewExecutable $view, DisplayPluginBase $display, array &$o
   }
 
   public function query() {
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
     $this->field_alias = $this->aliases['uid'];
   }
 
diff --git a/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
index 64480b5..83a1a49 100644
--- a/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
+++ b/core/modules/user/lib/Drupal/user/Plugin/views/field/Roles.php
@@ -31,7 +31,7 @@ public function init(ViewExecutable $view, DisplayPluginBase $display, array &$o
   }
 
   public function query() {
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
     $this->field_alias = $this->aliases['uid'];
   }
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php b/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php
index bc8dfff..6055f77 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php
@@ -102,7 +102,7 @@ public function query() {
     $params = $this->options['group_type'] != 'group' ? array('function' => $this->options['group_type']) : array();
     $this->field_alias = $this->query->add_field($this->tableAlias, $this->realField, NULL, $params);
 
-    $this->add_additional_fields();
+    $this->addAdditionalFields();
   }
 
   /**
@@ -115,7 +115,7 @@ public function query() {
    * form of
    * @code array('table' => $tablename, 'field' => $fieldname) @endcode
    */
-  function add_additional_fields($fields = NULL) {
+  protected function addAdditionalFields($fields = NULL) {
     if (!isset($fields)) {
       // notice check
       if (empty($this->additional_fields)) {