diff --git a/.travis.yml b/.travis.yml
index f3da4fc1..c3c1ca60 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: false
-dist: trusty
+
 language: node_js
 branches:
   only:
@@ -18,6 +18,11 @@ jobs:
       nodejs: 4.3
       env: WEBPACK_VERSION=latest JOB_PART=test
       script: npm run travis:$JOB_PART
+    - <<: *test-latest
+      os: osx
+      node_js: 8
+      env: WEBPACK_VERSION=latest JOB_PART=test
+      script: npm run travis:$JOB_PART
     - <<: *test-latest
       node_js: 8
       env: WEBPACK_VERSION=latest JOB_PART=lint
diff --git a/test/__snapshots__/es2015.test.js.snap b/test/__snapshots__/es2015.test.js.snap
index 2972a568..31427d00 100644
--- a/test/__snapshots__/es2015.test.js.snap
+++ b/test/__snapshots__/es2015.test.js.snap
@@ -121,7 +121,7 @@ exports[`es6: main.96c5ba3d7f23066ac123.js 1`] = `
 `;
 
 exports[`es6: manifest.a458e5044f91a97906ab.js 1`] = `
-"!(modules => {
+"(modules => {
     function __webpack_require__(moduleId) {
         if (installedModules[moduleId]) return installedModules[moduleId].exports;
         var module = installedModules[moduleId] = {
@@ -217,7 +217,7 @@ exports[`es7: main.96c5ba3d7f23066ac123.js 1`] = `
 `;
 
 exports[`es7: manifest.a458e5044f91a97906ab.js 1`] = `
-"!(modules => {
+"(modules => {
     function __webpack_require__(moduleId) {
         if (installedModules[moduleId]) return installedModules[moduleId].exports;
         var module = installedModules[moduleId] = {
@@ -313,7 +313,7 @@ exports[`es8: main.96c5ba3d7f23066ac123.js 1`] = `
 `;
 
 exports[`es8: manifest.a458e5044f91a97906ab.js 1`] = `
-"!(modules => {
+"(modules => {
     function __webpack_require__(moduleId) {
         if (installedModules[moduleId]) return installedModules[moduleId].exports;
         var module = installedModules[moduleId] = {