diff --git a/src/Form/SettingsForm.php b/src/Form/SettingsForm.php
index cdcb4d0..db1ce09 100644
--- a/src/Form/SettingsForm.php
+++ b/src/Form/SettingsForm.php
@@ -16,9 +16,9 @@ class SettingsForm extends ConfigFormBase {
   /**
    * The typed config service.
    *
-   * @var \Drupal\Core\Config\TypedConfigManagerInterface
+   * @var \Drupal\Core\Config\TypedConfigManagerInterface|null
    */
-  protected $typedConfigManager;
+  protected ?TypedConfigManagerInterface $typedConfigManager;
 
   /**
    * SettingsForm constructor.