diff --git a/core/lib/Drupal/Core/Entity/SqlStorageInterface.php b/core/lib/Drupal/Core/Entity/SqlStorageInterface.php
index 4bff3c2..757f618 100644
--- a/core/lib/Drupal/Core/Entity/SqlStorageInterface.php
+++ b/core/lib/Drupal/Core/Entity/SqlStorageInterface.php
@@ -9,7 +9,7 @@
 /**
  * A common interface for SQL-based storage controllers.
  */
-interface SqlStorageInterface {
+interface SqlStorageInterface extends EntityStorageInterface {
 
   /**
    * Gets a mapping of schema fields that will be stored per entity table.