diff --git a/core/lib/Drupal/Core/Lock/PersistentDatabaseLockBackend.php b/core/lib/Drupal/Core/Lock/PersistentDatabaseLockBackend.php
index 0199423..6aae072 100644
--- a/core/lib/Drupal/Core/Lock/PersistentDatabaseLockBackend.php
+++ b/core/lib/Drupal/Core/Lock/PersistentDatabaseLockBackend.php
@@ -7,6 +7,8 @@
 
 namespace Drupal\Core\Lock;
 
+use Drupal\Core\Database\Connection;
+
 /**
  * Defines the persistent database lock backend. This backend is global for this
  * Drupal installation.