diff --git a/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php b/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php
index 8602377..888ed9c 100644
--- a/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php
+++ b/core/modules/layout_discovery/tests/src/Kernel/LayoutTest.php
@@ -51,7 +51,7 @@ public function testRenderLayout($layout_id, $config, $regions, $html) {
 
     $this->render($built);
     $this->assertRaw($html);
-    $this->assertRaw('<input data-drupal-selector="edit-the-form-id" type="hidden" name="form_id" value="the_form_id" />');
+    $this->assertRaw('<input data-drupal-selector="edit-the-form-id" type="hidden" name="form_id" value="the_form_id">');
   }
 
   /**