diff --git a/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
index 285bae2d21..a3bb20508f 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityStorageBase.php
@@ -151,8 +151,7 @@ protected function initFieldValues(ContentEntityInterface $entity, array $values
   /**
    * {@inheritdoc}
    */
-  public function createTranslation(TranslatableInterface $entity, $langcode, array $values = []) {
-    /** @var \Drupal\Core\Entity\ContentEntityInterface $translation */
+  public function createTranslation(ContentEntityInterface $entity, $langcode, array $values = []) {
     $translation = $entity->getTranslation($langcode);
     $definitions = array_filter($translation->getFieldDefinitions(), function (FieldDefinitionInterface $definition) {
       return $definition->isTranslatable();
diff --git a/core/lib/Drupal/Core/Entity/KeyValueStore/KeyValueContentEntityStorage.php b/core/lib/Drupal/Core/Entity/KeyValueStore/KeyValueContentEntityStorage.php
index 3724d4329a..2c57405c19 100644
--- a/core/lib/Drupal/Core/Entity/KeyValueStore/KeyValueContentEntityStorage.php
+++ b/core/lib/Drupal/Core/Entity/KeyValueStore/KeyValueContentEntityStorage.php
@@ -2,8 +2,8 @@
 
 namespace Drupal\Core\Entity\KeyValueStore;
 
+use Drupal\Core\Entity\ContentEntityInterface;
 use Drupal\Core\Entity\ContentEntityStorageInterface;
-use Drupal\Core\Entity\TranslatableInterface;
 
 /**
  * Provides a key value backend for content entities.
@@ -13,7 +13,7 @@ class KeyValueContentEntityStorage extends KeyValueEntityStorage implements Cont
   /**
    * {@inheritdoc}
    */
-  public function createTranslation(TranslatableInterface $entity, $langcode, array $values = []) {
+  public function createTranslation(ContentEntityInterface $entity, $langcode, array $values = []) {
     // @todo Complete the content entity storage implementation in
     //   https://www.drupal.org/node/2618436.
   }
diff --git a/core/lib/Drupal/Core/Entity/TranslatableStorageInterface.php b/core/lib/Drupal/Core/Entity/TranslatableStorageInterface.php
index 56c25f6408..2c99520d5b 100644
--- a/core/lib/Drupal/Core/Entity/TranslatableStorageInterface.php
+++ b/core/lib/Drupal/Core/Entity/TranslatableStorageInterface.php
@@ -10,7 +10,7 @@
   /**
    * Constructs a new entity translation object, without permanently saving it.
    *
-   * @param \Drupal\Core\Entity\TranslatableInterface $entity
+   * @param \Drupal\Core\Entity\ContentEntityInterface $entity
    *   The entity object being translated.
    * @param string $langcode
    *   The translation language code.
@@ -21,7 +21,10 @@
    * @return \Drupal\Core\Entity\TranslatableInterface
    *   Another instance of the specified entity object class with the specified
    *   active language and initial values.
+   *
+   * @todo Consider accepting \Drupal\Core\Entity\TranslatableInterface as first
+   *   parameter. See https://www.drupal.org/project/drupal/issues/2932049.
    */
-  public function createTranslation(TranslatableInterface $entity, $langcode, array $values = []);
+  public function createTranslation(ContentEntityInterface $entity, $langcode, array $values = []);
 
 }