diff --git a/core/modules/jsonapi/tests/src/Functional/RestJsonApiAuthException.php b/core/modules/jsonapi/tests/src/Functional/RestJsonApiAuthException.php
index 6955186e4c..dd3e28e554 100644
--- a/core/modules/jsonapi/tests/src/Functional/RestJsonApiAuthException.php
+++ b/core/modules/jsonapi/tests/src/Functional/RestJsonApiAuthException.php
@@ -21,7 +21,7 @@ class RestJsonApiAuthException extends ResourceTestBase {
   /**
    * {@inheritdoc}
    */
-  public static $modules = [
+  protected static $modules = [
     'jsonapi',
     'node',
     'user',