diff --git a/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php b/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php
index 8ed204383..ac05b0030 100644
--- a/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php
+++ b/modules/ppcp-settings/src/Endpoint/LoginLinkRestEndpoint.php
@@ -23,7 +23,7 @@ class LoginLinkRestEndpoint extends RestEndpoint {
 	 *
 	 * @var string
 	 */
-	protected $rest_base = 'login_link';
+	protected string $rest_base = 'login_link';
 
 	/**
 	 * Link generator list, with environment name as array key.