diff --git a/stryker.conf.js b/stryker.conf.js
index 88add63..9958df2 100644
--- a/stryker.conf.js
+++ b/stryker.conf.js
@@ -13,5 +13,5 @@ module.exports = {
   testRunner:       'command',
   transpilers:      [],
   coverageAnalysis: 'all',
-  mutate:           ['index.js']
+  mutate:           [ 'index.js' ]
 };