diff --git a/package.json b/package.json
index bea239bd..c967a3de 100644
--- a/package.json
+++ b/package.json
@@ -12,6 +12,7 @@
     "site:start": "npm run vuepress:start",
     "test": "lerna run test --stream --concurrency 1",
     "test:ci": "lerna run test:ci",
+    "test:es5": "lerna run test:es5 --stream --concurrency 1",
     "test:es5:bs": "lerna run test:es5:bs --stream --concurrency 1",
     "vuepress:build": "vuepress build docs",
     "vuepress:start": "vuepress dev docs"
diff --git a/packages/testing-karma/es5-settings.js b/packages/testing-karma/es5-settings.js
index 171423cb..f73834ca 100644
--- a/packages/testing-karma/es5-settings.js
+++ b/packages/testing-karma/es5-settings.js
@@ -10,7 +10,7 @@
  */
 module.exports = () => ({
   files: [
-    { pattern: require.resolve('@babel/polyfill/browser'), watched: false },
+    { pattern: require.resolve('@babel/polyfill/dist/polyfill.min.js'), watched: false },
     {
       pattern: require.resolve('@webcomponents/webcomponentsjs/custom-elements-es5-adapter'),
       watched: false,
diff --git a/packages/testing-karma/package.json b/packages/testing-karma/package.json
index bfb532ee..8dff8892 100644
--- a/packages/testing-karma/package.json
+++ b/packages/testing-karma/package.json
@@ -19,6 +19,7 @@
     "@babel/core": "^7.1.6",
     "@babel/plugin-syntax-import-meta": "^7.0.0",
     "@babel/polyfill": "^7.0.0",
+    "@babel/preset-env": "^7.0.0",
     "@open-wc/webpack": "^0.1.3",
     "@webcomponents/webcomponentsjs": "^2.2.0",
     "babel-loader": "^8.0.4",