diff --git a/core/lib/Drupal/Core/Entity/ContentEntityBase.php b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
index 58e8191..f8ef0af 100644
--- a/core/lib/Drupal/Core/Entity/ContentEntityBase.php
+++ b/core/lib/Drupal/Core/Entity/ContentEntityBase.php
@@ -17,7 +17,7 @@
  *
  * @ingroup entity_api
  */
-abstract class ContentEntityBase extends Entity implements \IteratorAggregate, ContentEntityInterface, TranslationStatusInterface {
+abstract class ContentEntityBase extends Entity implements \IteratorAggregate, ContentEntityInterface, TranslationStatusInterface, OriginalRevisionIdInterface {
 
   /**
    * The plain data values of the contained fields.
diff --git a/core/lib/Drupal/Core/Entity/OriginalRevisionIdInterface.php b/core/lib/Drupal/Core/Entity/OriginalRevisionIdInterface.php
index e69de29..4cacc4e 100644
--- a/core/lib/Drupal/Core/Entity/OriginalRevisionIdInterface.php
+++ b/core/lib/Drupal/Core/Entity/OriginalRevisionIdInterface.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Drupal\Core\Entity;
+
+interface OriginalRevisionIdInterface {
+
+  /**
+   * Gets the original revision identifier of the entity.
+   *
+   * After calling ::setNewRevision, the revision identifier will be unset to
+   * enforce the creation of a new revision identifier on save and
+   * ::getRevisionId will not be able to return the revision identifier, for
+   * which the entity has been loaded, but ::getOriginalRevisionId will.
+   *
+   * @return
+   *   The original revision identifier of the entity, or NULL if the entity
+   *   does not have a revision identifier.
+   */
+  public function getOriginalRevisionId();
+
+  /**
+   * Resets the original revision identifier after the entity got a new one.
+   *
+   * After the entity has been saved, the storage should call this function to
+   * set the original revision identifier to the new one, the entity received
+   * after it has been saved.
+   */
+  public function resetOriginalRevisionId();
+
+}
diff --git a/core/lib/Drupal/Core/Entity/RevisionableInterface.php b/core/lib/Drupal/Core/Entity/RevisionableInterface.php
index e9ed5e2..14690e3 100644
--- a/core/lib/Drupal/Core/Entity/RevisionableInterface.php
+++ b/core/lib/Drupal/Core/Entity/RevisionableInterface.php
@@ -40,29 +40,6 @@ public function setNewRevision($value = TRUE);
   public function getRevisionId();
 
   /**
-   * Gets the original revision identifier of the entity.
-   *
-   * After calling ::setNewRevision, the revision identifier will be unset to
-   * enforce the creation of a new revision identifier on save and
-   * ::getRevisionId will not be able to return the revision identifier, for
-   * which the entity has been loaded, but ::getOriginalRevisionId will.
-   *
-   * @return
-   *   The original revision identifier of the entity, or NULL if the entity
-   *   does not have a revision identifier.
-   */
-  public function getOriginalRevisionId();
-
-  /**
-   * Resets the original revision identifier after the entity got a new one.
-   *
-   * After the entity has been saved, the storage should call this function to
-   * set the original revision identifier to the new one, the entity received
-   * after it has been saved.
-   */
-  public function resetOriginalRevisionId();
-
-  /**
    * Checks if this entity is the default revision.
    *
    * @param bool $new_value