diff --git a/src/adapter.js b/src/adapter.js
index bf75712..8e5c09d 100644
--- a/src/adapter.js
+++ b/src/adapter.js
@@ -173,12 +173,11 @@ var createMochaReporterConstructor = function (tc, pathname) {
   }
 }
 /* eslint-disable no-unused-vars */
-var createMochaStartFn = function (mocha) {
+var createMochaStartFn = function (karma, mocha) {
   /* eslint-enable no-unused-vars */
-  return function (config) {
-    var clientArguments
-    config = config || {}
-    clientArguments = config.args
+  return function () {
+    var config = karma.config || {}
+    var clientArguments = config.args
 
     if (clientArguments) {
       if (Object.prototype.toString.call(clientArguments) === '[object Array]') {
diff --git a/src/adapter.wrapper b/src/adapter.wrapper
index 5281d41..53b31b0 100644
--- a/src/adapter.wrapper
+++ b/src/adapter.wrapper
@@ -2,6 +2,6 @@
 
 %CONTENT%
 
-  window.__karma__.start = createMochaStartFn(window.mocha)
+  window.__karma__.start = createMochaStartFn(window.__karma__, window.mocha)
   window.mocha.setup(createConfigObject(window.__karma__))
 })(window)