diff --git a/core/modules/simpletest/src/Form/SimpletestTestForm.php b/core/modules/simpletest/src/Form/SimpletestTestForm.php
index 3c0fb2687246ede7c61c27f0a959431f3af2a08d..f369fa86334043ad92831945044f0bb8d3346338 100644
--- a/core/modules/simpletest/src/Form/SimpletestTestForm.php
+++ b/core/modules/simpletest/src/Form/SimpletestTestForm.php
@@ -144,7 +144,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
         );
         $form['tests'][$class]['title'] = array(
           '#type' => 'label',
-          '#title' => $info['name'],
+          '#title' => '\\' . $info['name'],
           '#wrapper_attributes' => array(
             'class' => array('simpletest-test-label', 'table-filter-text-source'),
           ),