diff --git a/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php b/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php
index 5ffd00c..fe33136 100644
--- a/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php
+++ b/core/modules/system/tests/modules/form_test/src/Form/FormTestGroupContainerForm.php
@@ -51,7 +51,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
    * {@inheritdoc}
    */
   public function validateForm(array &$form, FormStateInterface $form_state) {
-    if ($form_state->getValue('error_on_details') == True) {
+    if ($form_state->getValue('error_on_details') == TRUE) {
       $form_state->setErrorByName('meta', 'I am an error on the details element.');
     }
   }