diff --git a/babel.config.js b/babel.config.js
index 044c191..7119f5d 100644
--- a/babel.config.js
+++ b/babel.config.js
@@ -4,6 +4,7 @@ module.exports = {
 			'@babel/preset-env',
 			{
 				loose: true,
+				modules: process.env.BABEL_ENV === 'test' ? 'commonjs' : 'auto',
 				targets: {
 					node: 'current',
 				},
diff --git a/package.json b/package.json
index 120a734..c6420b6 100644
--- a/package.json
+++ b/package.json
@@ -12,7 +12,7 @@
     "prepare": "npm run -s build",
     "prepare:babel": "babel src/*.js -d dist && npm t",
     "lint": "eslint src",
-    "test": "npm run -s lint && npm run -s build && jest",
+    "test": "npm run -s lint && npm run -s build && BABEL_ENV=test jest",
     "release": "npm run -s prepare && npm test && git commit -am $npm_package_version && git tag $npm_package_version && git push && git push --tags && npm publish"
   },
   "repository": "developit/microbundle",
diff --git a/test/__snapshots__/index.test.js.snap b/test/__snapshots__/index.test.js.snap
index 4ecac6b..3b5d26c 100644
--- a/test/__snapshots__/index.test.js.snap
+++ b/test/__snapshots__/index.test.js.snap
@@ -77,12 +77,12 @@ basic-json
 
 
 Build \\"basicJson\\" to dist:
-146 B: basic-json.js.gz
-97 B: basic-json.js.br
-145 B: basic-json.mjs.gz
-98 B: basic-json.mjs.br
-225 B: basic-json.umd.js.gz
-161 B: basic-json.umd.js.br"
+130 B: basic-json.js.gz
+81 B: basic-json.js.br
+129 B: basic-json.mjs.gz
+81 B: basic-json.mjs.br
+209 B: basic-json.umd.js.gz
+149 B: basic-json.umd.js.br"
 `;
 
 exports[`fixtures basic-ts 1`] = `