diff --git a/lib/metaltest.test.js b/lib/metaltest.test.js
index 5d0ee32..c45a7b6 100644
--- a/lib/metaltest.test.js
+++ b/lib/metaltest.test.js
@@ -5,7 +5,7 @@ const test = metaltest('Metaltest')
 export { test }
 
 test('success', () => new Promise((s, f) => setTimeout(s, 500)))
-test('not equal', () => assert.notEqual({ a: 1 }, { a: 2 }))
+test('not equal', () => assert.notDeepEqual({ a: 1 }, { a: 2 }))
 test('fail with the message', () => new Promise((s, f) => setTimeout(s, 500)))
 test('throw', () => {
   return assert.rejects(async () => {