diff -u b/core/lib/Drupal/Core/TypedData/TranslatableInterface.php b/core/lib/Drupal/Core/TypedData/TranslatableInterface.php
--- b/core/lib/Drupal/Core/TypedData/TranslatableInterface.php
+++ b/core/lib/Drupal/Core/TypedData/TranslatableInterface.php
@@ -100,10 +100,2 @@
 
-  /**
-   * Returns the translation support status of the bundle.
-   *
-   * @return bool
-   *   TRUE if the bundle of the object has translation support enabled.
-   */
-  protected function isTranslationEnabled();
-
 }