diff --git a/src/renderer/webtorrent.js b/src/renderer/webtorrent.js
index ff472fcf..e21c1c1c 100644
--- a/src/renderer/webtorrent.js
+++ b/src/renderer/webtorrent.js
@@ -41,7 +41,7 @@ var VERSION = require('../../package.json').version
  */
 var VERSION_STR = VERSION.match(/([0-9]+)/g)
   .slice(0, 2)
-  .map(function (v) { return zeroFill(2, v) })
+  .map((v) => zeroFill(2, v))
   .join('')
 
 /**