diff --git a/packages/aws-cdk/test/account-cache.test.ts b/packages/aws-cdk/test/account-cache.test.ts
index 0c8334136c6f1..530edfd5e7bfb 100644
--- a/packages/aws-cdk/test/account-cache.test.ts
+++ b/packages/aws-cdk/test/account-cache.test.ts
@@ -118,7 +118,7 @@ test('cache pretends to be empty if cache file does not contain JSON', async() =
   try {
     await fs.writeFile(cacheFile, '');
 
-    await expect(cache.get('abc')).resolves.toEqual(undefined);
+    await expect(cache.get('abc')).resolves.toBeUndefined();
   } finally {
     await nukeCache(cacheDir);
   }