diff --git a/test/e2e/fixtures/build-default/src/index.ts b/test/e2e/fixtures/build-default/src/index.ts
index dbe6450a3..308bd9487 100644
--- a/test/e2e/fixtures/build-default/src/index.ts
+++ b/test/e2e/fixtures/build-default/src/index.ts
@@ -3,6 +3,7 @@ import './syntax/optional-chaining';
 
 import './syntax/jsx-import/JSX-import-JSX';
 
+import './syntax/async';
 export { testGenerator } from './syntax/generator';
 
 export { foo } from './foo';
diff --git a/test/e2e/fixtures/build-default/src/syntax/async.ts b/test/e2e/fixtures/build-default/src/syntax/async.ts
new file mode 100644
index 000000000..2cd9e2d48
--- /dev/null
+++ b/test/e2e/fixtures/build-default/src/syntax/async.ts
@@ -0,0 +1,6 @@
+// regression test for async/await
+// code inspired by https://github.com/formium/tsdx/issues/869
+(async () => {
+  await Promise.resolve();
+  console.log('a side effect to make sure this is output');
+})();