diff --git a/core/lib/Drupal/Core/Field/FieldItemBase.php b/core/lib/Drupal/Core/Field/FieldItemBase.php
index 84d73ec..025edab 100644
--- a/core/lib/Drupal/Core/Field/FieldItemBase.php
+++ b/core/lib/Drupal/Core/Field/FieldItemBase.php
@@ -206,11 +206,6 @@ public function delete() { }
   /**
    * {@inheritdoc}
    */
-  public static function generateSampleValue(FieldDefinitionInterface $field_definition) { }
-
-  /**
-   * {@inheritdoc}
-   */
   public function deleteRevision() { }
 
   /**
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
index 18935c1..21fef11 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/LanguageItem.php
@@ -2,6 +2,7 @@
 
 namespace Drupal\Core\Field\Plugin\Field\FieldType;
 
+use Drupal\Core\Field\FieldDefinitionInterface;
 use Drupal\Core\Field\FieldStorageDefinitionInterface;
 use Drupal\Core\Field\FieldItemBase;
 use Drupal\Core\Language\LanguageInterface;
@@ -117,4 +118,12 @@ public function onChange($property_name, $notify = TRUE) {
     parent::onChange($property_name, $notify);
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function generateSampleValue(FieldDefinitionInterface $field_definition) {
+    $values['value'] = 'en';
+    return $values;
+  }
+
 }