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diff --git a/web/core/modules/system/tests/modules/form_test/src/Form/FormTestInputForgeryForm.php b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestInputForgeryForm.php
index c8a82c88b..8cdac632d 100644
--- a/web/core/modules/system/tests/modules/form_test/src/Form/FormTestInputForgeryForm.php
+++ b/web/core/modules/system/tests/modules/form_test/src/Form/FormTestInputForgeryForm.php
@@ -33,10 +33,29 @@ class FormTestInputForgeryForm extends FormBase {
       '#type' => 'submit',
       '#value' => t('Submit'),
     ];
+    $form['#post_render'][] = [static::class, 'postRender'];
 
     return $form;
   }
 
+  /**
+   * Alters the rendered form to simulate input forgery.
+   *
+   * It's necessary to alter the rendered form here because Mink does not
+   * support manipulating the DOM tree.
+   *
+   * @param string $rendered_form
+   *   The rendered form.
+   *
+   * @return string
+   *   The modified rendered form.
+   *
+   * @see \Drupal\Tests\system\Functional\Form\FormTest::testInputForgery()
+   */
+  public static function postRender($rendered_form) {
+    return str_replace('value="two"', 'value="FORGERY"', $rendered_form);
+  }
+
   /**
    * {@inheritdoc}
    */