diff --git a/index.js b/index.js
index edf4cd8..0ac1c7e 100644
--- a/index.js
+++ b/index.js
@@ -1,18 +1,21 @@
 var through = require('through2');
 
-module.exports = function(ver) {
-    var ver = ver || 'ver'
-    // convert a-xxxxxxxx.css to a.css?ver=xxxxxxxx
-    function hashToQuery(file) {
-        var content = new String(file.contents);
-        content = content.replace(/(\-(\w+))(\.\w+)/g, function($, $1, $2, $3) {
-            return $3 + '?' + ver + '=' + $2;
-        })
-        file.contents = new Buffer(content);
-        file.ver = ver;
-        return file;
+module.exports = function (ver) {
+  var ver = ver || 'ver'
+  // convert a-xxxxxxxx.css to a.css?ver=xxxxxxxx
+  function hashToQuery(file) {
+    var content = new String(file.contents);
+    var manifestObj = JSON.parse(content)
+    for (var key in manifestObj) {
+      manifestObj[key] = manifestObj[key].replace(/(\-(\w+))((\.[-\w]+)+)/g, function ($, $1, $2, $3) {
+        return $3 + '?' + ver + '=' + $2;
+      })
     }
-    return through.obj(function(file, encoding, callback) {
-        callback(null, hashToQuery(file));
-    });
+    file.contents = new Buffer(JSON.stringify(manifestObj, null, '\t'));
+    file.ver = ver;
+    return file;
+  }
+  return through.obj(function (file, encoding, callback) {
+    callback(null, hashToQuery(file));
+  });
 };