diff --git a/module/VuFind/src/VuFind/Auth/Manager.php b/module/VuFind/src/VuFind/Auth/Manager.php
index 197e7d6c93b..55d44e82cc5 100644
--- a/module/VuFind/src/VuFind/Auth/Manager.php
+++ b/module/VuFind/src/VuFind/Auth/Manager.php
@@ -95,7 +95,7 @@ class Manager implements
     /**
      * ILS Authenticator
      *
-     * @var ILSAuthenticator
+     * @var ?ILSAuthenticator
      */
     protected $ilsAuthenticator = null;