diff --git a/src/Config.php b/src/Config.php
index 572910e..279c1cc 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -15,6 +15,13 @@ class Config implements ConfigInterface {
 
   use RefinableCacheableDependencyTrait;
 
+  /**
+   * The config factory service.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
   /**
    * The openseadragon config.
    *