diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
index 52583c7..517509a 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/BooleanItem.php
@@ -19,13 +19,6 @@
  *   id = "boolean",
  *   label = @Translation("Boolean"),
  *   description = @Translation("An entity field containing a boolean value."),
- *   settings = {
- *     "allowed_values" = {
- *       "0" = 0,
- *       "1" = 1
- *     },
- *     "allowed_values_function" = ""
- *   },
  *   default_widget = "boolean",
  *   default_formatter = "number_unformatted",
  * )
@@ -35,6 +28,16 @@ class BooleanItem extends FieldItemBase {
   /**
    * {@inheritdoc}
    */
+  public static function defaultSettings() {
+  return array(
+    'allowed_values' => array(0, 1),
+    'allowed_values_function' => '',
+  ) + parent::defaultSettings();
+}
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties['value'] = DataDefinition::create('boolean')
       ->setLabel(t('Boolean value'));