diff --git a/lib/middleware/source_files.js b/lib/middleware/source_files.js
index fc5a12086..4f395756f 100644
--- a/lib/middleware/source_files.js
+++ b/lib/middleware/source_files.js
@@ -1,11 +1,9 @@
-/**
- * Source Files middleware is responsible for serving all the source files under the test.
- */
-
 var from = require('core-js/library/fn/array/from')
 var querystring = require('querystring')
 var common = require('./common')
 var _ = require('../helper')._
+var logger = require('../logger')
+var log = logger.create('middlware:source-files')
 
 // Files is a Set
 var findByPath = function (files, path) {
@@ -14,9 +12,8 @@ var findByPath = function (files, path) {
   })
 }
 
-var createSourceFilesMiddleware = function (filesPromise, serveFile,
-  /* config.basePath */ basePath,
-  /* config.urlRoot */ urlRoot) {
+// Source Files middleware is responsible for serving all the source files under the test.
+var createSourceFilesMiddleware = function (filesPromise, serveFile, basePath, urlRoot) {
   return function (request, response, next) {
     var requestedFilePath = querystring.unescape(request.url)
       .replace(urlRoot, '/')
@@ -26,6 +23,9 @@ var createSourceFilesMiddleware = function (filesPromise, serveFile,
 
     request.pause()
 
+    log.debug('Requesting %s', request.url, urlRoot)
+    log.debug('Fetching %s', requestedFilePath)
+
     return filesPromise.then(function (files) {
       // TODO(vojta): change served to be a map rather then an array
       var file = findByPath(files.served, requestedFilePath)
@@ -49,7 +49,9 @@ var createSourceFilesMiddleware = function (filesPromise, serveFile,
   }
 }
 
-createSourceFilesMiddleware.$inject = ['filesPromise', 'serveFile', 'config.basePath']
+createSourceFilesMiddleware.$inject = [
+  'filesPromise', 'serveFile', 'config.basePath', 'config.urlRoot'
+]
 
 // PUBLIC API
 exports.create = createSourceFilesMiddleware
diff --git a/test/e2e/proxy.feature b/test/e2e/proxy.feature
index 48872cf34..1a77b7700 100644
--- a/test/e2e/proxy.feature
+++ b/test/e2e/proxy.feature
@@ -22,3 +22,24 @@ Feature: Proxying
       .
       PhantomJS
       """
+
+  Scenario: URLRoot
+    Given a configuration with:
+      """
+      files = ['proxy/*.js'];
+      browsers = ['PhantomJS'];
+      plugins = [
+        'karma-jasmine',
+        'karma-phantomjs-launcher'
+      ];
+      urlRoot = '/__karma__';
+      proxies = {
+        '/foo.js': '/base/proxy/foo.js'
+      }
+      """
+    When I start Karma
+    Then it passes with:
+      """
+      .
+      PhantomJS
+      """