diff --git a/src/ContentNotifyManager.php b/src/ContentNotifyManager.php
index f558418e15..06257fd6c4 100644
--- a/src/ContentNotifyManager.php
+++ b/src/ContentNotifyManager.php
@@ -76,6 +76,13 @@ class ContentNotifyManager {
    */
   protected $state;

+  /**
+   * The configuration object.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $config;
+
   /**
    * Constructs a ContentNotifyManager object.
    */
diff --git a/src/Form/NotifyExtendForm.php b/src/Form/NotifyExtendForm.php
index 9b7f56ad39..dfd9512e76 100644
--- a/src/Form/NotifyExtendForm.php
+++ b/src/Form/NotifyExtendForm.php
@@ -34,6 +34,13 @@ class NotifyExtendForm extends FormBase {
    */
   protected $configFactory;

+  /**
+   * The configuration object.
+   *
+   * @var \Drupal\Core\Config\Config
+   */
+  protected $config;
+
   /**
    * Constructs a NotifyExtendForm object.
    *