diff --git a/lib/api/encodeGlobal.js b/lib/api/encodeGlobal.js
index 9e91c73a0..20b706e8e 100644
--- a/lib/api/encodeGlobal.js
+++ b/lib/api/encodeGlobal.js
@@ -4,6 +4,7 @@ var PathUtils = require('../utils/path');
 
 var deprecate = require('./deprecate');
 var encodeConfig = require('./encodeConfig');
+var fileToURL = require('../output/helper/fileToURL');
 
 /**
     Encode a global context into a JS object
@@ -41,8 +42,8 @@ function encodeGlobal(output) {
             Convert a filepath into an url
             @return {String}
         */
-        toURL: function(s) {
-            return s;
+        toURL: function(filePath) {
+            return fileToURL(output, filePath);
         },
 
         /**