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 19fe3e1..c3f0c0d 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
@@ -223,7 +223,7 @@ function add_field_table($use_groupby) {
   /**
    * Determine if this field is click sortable.
    */
-  function click_sortable() {
+  public function clickSortable() {
     // Not click sortable in any case.
     if (empty($this->definition['click sortable'])) {
       return FALSE;
diff --git a/core/modules/translation_entity/lib/Drupal/translation_entity/Plugin/views/field/TranslationLink.php b/core/modules/translation_entity/lib/Drupal/translation_entity/Plugin/views/field/TranslationLink.php
index 618b6ae..2050e5e 100644
--- a/core/modules/translation_entity/lib/Drupal/translation_entity/Plugin/views/field/TranslationLink.php
+++ b/core/modules/translation_entity/lib/Drupal/translation_entity/Plugin/views/field/TranslationLink.php
@@ -78,9 +78,9 @@ public function query() {
   }
 
   /**
-   * Overrides \Drupal\views\Plugin\views\Plugin\field\FieldPluginBase::click_sortable().
+   * Overrides \Drupal\views\Plugin\views\Plugin\field\FieldPluginBase::clickSortable().
    */
-  public function click_sortable() {
+  public function clickSortable() {
     return FALSE;
   }
 
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..5bc3015 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
@@ -181,7 +181,7 @@ function click_sort($order) {
    *   The value of 'click sortable' from the plugin definition, this defaults
    *   to TRUE if not set.
    */
-  function click_sortable() {
+  public function clickSortable() {
     return isset($this->definition['click sortable']) ? $this->definition['click sortable'] : TRUE;
   }
 
diff --git a/core/modules/views/lib/Drupal/views/Plugin/views/style/Table.php b/core/modules/views/lib/Drupal/views/Plugin/views/style/Table.php
index fa868c7..753b730 100644
--- a/core/modules/views/lib/Drupal/views/Plugin/views/style/Table.php
+++ b/core/modules/views/lib/Drupal/views/Plugin/views/style/Table.php
@@ -277,7 +277,7 @@ public function buildOptionsForm(&$form, &$form_state) {
         '#options' => $field_names,
         '#default_value' => $column,
       );
-      if ($handlers[$field]->click_sortable()) {
+      if ($handlers[$field]->clickSortable()) {
         $form['info'][$field]['sortable'] = array(
           '#type' => 'checkbox',
           '#default_value' => !empty($this->options['info'][$field]['sortable']),
diff --git a/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php b/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php
index d5f2eac..484d593 100644
--- a/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/Handler/FieldUnitTest.php
@@ -530,17 +530,17 @@ public function testClickSortable() {
       'field' => 'name',
     );
     $plugin = views_get_handler($item, 'field');
-    $this->assertTrue($plugin->click_sortable(), 'TRUE as a default value is correct.');
+    $this->assertTrue($plugin->clickSortable(), 'TRUE as a default value is correct.');
 
     // Test that click_sortable is TRUE by when set TRUE in the data.
     $item['field'] = 'id';
     $plugin = views_get_handler($item, 'field');
-    $this->assertTrue($plugin->click_sortable(), 'TRUE as a views data value is correct.');
+    $this->assertTrue($plugin->clickSortable(), 'TRUE as a views data value is correct.');
 
     // Test that click_sortable is FALSE by when set FALSE in the data.
     $item['field'] = 'job';
     $plugin = views_get_handler($item, 'field');
-    $this->assertFalse($plugin->click_sortable(), 'FALSE as a views data value is correct.');
+    $this->assertFalse($plugin->clickSortable(), 'FALSE as a views data value is correct.');
   }
 
   /**
diff --git a/core/modules/views/views.theme.inc b/core/modules/views/views.theme.inc
index 7b47475..1af0eb3 100644
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -519,7 +519,7 @@ function template_preprocess_views_view_table(&$vars) {
     // render the header labels
     if ($field == $column && empty($fields[$field]->options['exclude'])) {
       $label = check_plain(!empty($fields[$field]) ? $fields[$field]->label() : '');
-      if (empty($options['info'][$field]['sortable']) || !$fields[$field]->click_sortable()) {
+      if (empty($options['info'][$field]['sortable']) || !$fields[$field]->clickSortable()) {
         $vars['header'][$field] = $label;
       }
       else {