diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsWidgetBase.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsWidgetBase.php
index ca00bcc..3bcd19d 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsWidgetBase.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/OptionsWidgetBase.php
@@ -67,7 +67,7 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
    *   The form state.
    */
   public static function validateElement(array $element, FormStateInterface $form_state) {
-    if ($element['#required'] && $element['#value'] == '_none') {
+    if ($element['#required'] && $element['#value'] == '') {
       $form_state->setError($element, t('@name field is required.', ['@name' => $element['#title']]));
     }

@@ -85,7 +85,7 @@ public static function validateElement(array $element, FormStateInterface $form_

     // Filter out the 'none' option. Use a strict comparison, because
     // 0 == 'any string'.
-    $index = array_search('_none', $values, TRUE);
+    $index = array_search('', $values, TRUE);
     if ($index !== FALSE) {
       unset($values[$index]);
     }
@@ -117,7 +117,7 @@ protected function getOptions(FieldableEntityInterface $entity) {

       // Add an empty option if the widget needs one.
       if ($empty_label = $this->getEmptyLabel()) {
-        $options = ['_none' => $empty_label] + $options;
+        $options = ['' => $empty_label] + $options;
       }

       $module_handler = \Drupal::moduleHandler();
diff --git a/core/modules/options/options.api.php b/core/modules/options/options.api.php
index 28ac771..7c00171 100644
--- a/core/modules/options/options.api.php
+++ b/core/modules/options/options.api.php
@@ -32,7 +32,7 @@ function hook_options_list_alter(array &$options, array $context) {
   // Check if this is the field we want to change.
   if ($context['fieldDefinition']->id() == 'field_option') {
     // Change the label of the empty option.
-    $options['_none'] = t('== Empty ==');
+    $options[''] = t('== Empty ==');
   }
 }