diff -u b/core/modules/migrate/src/MigrateTemplateStorage.php b/core/modules/migrate/src/MigrateTemplateStorage.php
--- b/core/modules/migrate/src/MigrateTemplateStorage.php
+++ b/core/modules/migrate/src/MigrateTemplateStorage.php
@@ -8,13 +8,13 @@
 namespace Drupal\migrate;
 
 use Drupal\Component\Discovery\YamlDiscovery;
-use Drupal\Core\Config\ExtensionInstallStorage as BaseExtensionInstallStorage;
+use Drupal\Core\Config\ExtensionInstallStorage;
 use Drupal\Core\Config\StorageInterface;
 
 /**
  * Storage to access migration template configuration in enabled extensions.
  */
-class MigrateTemplateStorage extends BaseExtensionInstallStorage {
+class MigrateTemplateStorage extends ExtensionInstallStorage {
 
   /**
    * Extension sub-directory containing default configuration for migrations.