diff --git a/test/unit/karma.conf.js b/test/unit/karma.conf.js
index 048b72905c..ce413a43e2 100644
--- a/test/unit/karma.conf.js
+++ b/test/unit/karma.conf.js
@@ -55,7 +55,7 @@ module.exports = function (config) {
     // 2. add it to the `browsers` array below.
     browsers: ['PhantomJS'],
     frameworks: ['mocha', 'sinon-chai'],
-    reporters: ['spec', 'coverage'],
+    reporters: ['spec'],
     files: ['./index.js'],
     preprocessors: {
       './index.js': ['webpack', 'sourcemap']