diff --git a/.travis.yml b/.travis.yml
index 0cd193b4..782a5339 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,7 +15,7 @@ install:
 
 script:
   - npm run lint
-  - npm test
+  - npm test -- --browsers ChromeHeadless
   - npm run build
 
 after_script:
diff --git a/karma.conf.js b/karma.conf.js
index b54650c7..95684f7c 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -34,7 +34,10 @@ module.exports = function(config) {
 
     autoWatch: true,
 
-    browsers: ['FirefoxHeadless', 'ChromeHeadless'],
+    browsers: [
+      'FirefoxHeadless',
+      'ChromeHeadless'
+    ],
 
     singleRun: false,