diff --git a/rollup.mjs b/rollup.mjs
index 45a8ea3..c163717 100644
--- a/rollup.mjs
+++ b/rollup.mjs
@@ -8,6 +8,7 @@ export default {
 	],
 	plugins: [
 		babel({
+			babelHelpers: 'bundled',
 			presets: [
 				['@babel/env', { modules: false, targets: { node: 12 } }],
 			],
diff --git a/test/_sourcemaps.mjs b/test/_sourcemaps.mjs
index c0f1892..b867711 100644
--- a/test/_sourcemaps.mjs
+++ b/test/_sourcemaps.mjs
@@ -25,12 +25,14 @@ test('produces correct sourcemaps', async () => {
 	assert.equal(result.css, expect);
 	assert.equal(result.warnings().length, 0);
 
+	const actual = result.map.toJSON();
+	actual.sources.splice(0, 1);
+
 	assert.deepStrictEqual(
-		result.map.toJSON(),
+		actual,
 		{
 			version: 3,
 			sources: [
-				'file:///Users/romainmenke/projects/postcss-sass/basic.scss%23sass',
 				'basic.scss',
 			],
 			names: [],