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diff --git a/web/core/lib/Drupal/Core/Block/BlockBase.php b/web/core/lib/Drupal/Core/Block/BlockBase.php
index a5f7fa9ed..bebdf09bd 100644
--- a/web/core/lib/Drupal/Core/Block/BlockBase.php
+++ b/web/core/lib/Drupal/Core/Block/BlockBase.php
@@ -11,6 +11,7 @@ use Drupal\Component\Utility\NestedArray;
 use Drupal\Core\Language\LanguageInterface;
 use Drupal\Core\Plugin\PluginWithFormsInterface;
 use Drupal\Core\Plugin\PluginWithFormsTrait;
+use Drupal\Core\Render\PreviewFallbackInterface;
 use Drupal\Core\Session\AccountInterface;
 use Drupal\Component\Transliteration\TransliterationInterface;
 
@@ -23,7 +24,7 @@ use Drupal\Component\Transliteration\TransliterationInterface;
  *
  * @ingroup block_api
  */
-abstract class BlockBase extends ContextAwarePluginBase implements BlockPluginInterface, PluginWithFormsInterface {
+abstract class BlockBase extends ContextAwarePluginBase implements BlockPluginInterface, PluginWithFormsInterface, PreviewFallbackInterface {
 
   use ContextAwarePluginAssignmentTrait;
   use MessengerTrait;
@@ -252,6 +253,13 @@ abstract class BlockBase extends ContextAwarePluginBase implements BlockPluginIn
     return $transliterated;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public function getPreviewFallbackString() {
+    return $this->t('Placeholder for the "@block" block', ['@block' => $this->label()]);
+  }
+
   /**
    * Wraps the transliteration service.
    *