diff --git a/src/core/index.ts b/src/core/index.ts
index f3039ce..53b0e9c 100644
--- a/src/core/index.ts
+++ b/src/core/index.ts
@@ -24,7 +24,9 @@ export function transformQuansync(
   id: string,
 ): CodeTransform | undefined {
   const lang = getLang(id)
-  const program = babelParse(code, lang)
+  const program = babelParse(code, lang, {
+    createParenthesizedExpressions: true,
+  })
   const imports: Record<string, ImportBinding> = Object.create(null)
 
   for (const node of program.body) {
diff --git a/tests/__snapshots__/transform.test.ts.snap b/tests/__snapshots__/transform.test.ts.snap
index 071195d..f6fe890 100644
--- a/tests/__snapshots__/transform.test.ts.snap
+++ b/tests/__snapshots__/transform.test.ts.snap
@@ -154,7 +154,7 @@ export const echo = quansync({
 
 const echoNewLine = quansync(
   /** @param {string|Promise<string>} v */ function* (v) {
-return ((yield echo(yield v))) + '\\n'
+return (yield echo(yield v)) + '\\n'
 },
 )
 
@@ -169,3 +169,13 @@ export default async () => {
 }
 "
 `;
+
+exports[`transform > ./fixtures/parens.js 1`] = `
+"import { quansync } from 'quansync/macro'
+
+const parens = quansync(function* (obj) {
+  const config = yield (obj + 1)
+  return config
+})
+"
+`;
diff --git a/tests/fixtures/parens.js b/tests/fixtures/parens.js
new file mode 100644
index 0000000..0120502
--- /dev/null
+++ b/tests/fixtures/parens.js
@@ -0,0 +1,6 @@
+import { quansync } from 'quansync/macro'
+
+const parens = quansync(async (obj) => {
+  const config = await (obj + 1)
+  return config
+})
diff --git a/tests/transform.test.ts b/tests/transform.test.ts
index 48c4d99..44d932a 100644
--- a/tests/transform.test.ts
+++ b/tests/transform.test.ts
@@ -21,7 +21,7 @@ describe('transform', async () => {
       const filePath = path.resolve(dirname, `temp/${path.basename(id)}`)
       await writeFile(filePath, result)
       const mod = await import(`${pathToFileURL(filePath).href}?${Date.now()}`)
-      await mod.default()
+      await mod.default?.()
 
       return result
     },