diff --git a/test/custom-elements/samples/shadowdom-closed/test.js b/test/custom-elements/samples/shadowdom-closed/test.js
index be2b9743e0..cc0ed2ff8e 100644
--- a/test/custom-elements/samples/shadowdom-closed/test.js
+++ b/test/custom-elements/samples/shadowdom-closed/test.js
@@ -8,6 +8,6 @@ export default function (target) {
 	assert.equal(el.name, 'world');
 
 	const h1 = el._root.querySelector('h1');
-  assert.equal(h1.textContent, 'Hello world');
+  assert.equal(h1.textContent, 'Hello world!');
   assert.equal(el.shadowRoot, null);
 }
\ No newline at end of file