diff --git a/core/modules/outside_in/tests/modules/off_canvas_test/src/Controller/TestController.php b/core/modules/outside_in/tests/modules/off_canvas_test/src/Controller/TestController.php
index 6164b06fc2..13a9217a8c 100644
--- a/core/modules/outside_in/tests/modules/off_canvas_test/src/Controller/TestController.php
+++ b/core/modules/outside_in/tests/modules/off_canvas_test/src/Controller/TestController.php
@@ -19,7 +19,7 @@ class TestController {
   public function thing1() {
     return [
       '#type' => 'markup',
-      '#markup' => 'Thing 1 says hello',
+      '#markup' => str_repeat('Thing 1 says hello', 100) . " - <p>The bottom</p>",
     ];
   }