diff --git a/karma-tests/wombat.spec.js b/karma-tests/wombat.spec.js
index 56e6af7e..b9b64c27 100644
--- a/karma-tests/wombat.spec.js
+++ b/karma-tests/wombat.spec.js
@@ -80,7 +80,7 @@ function runWombatTest(testCase, done) {
         try {
             testFrame.contentWindow.eval(testCase.wombatScript);
             runFunctionInIFrame(function () {
-                new window._WBWombat(wbinfo);
+                new window._WBWombat(window, wbinfo);
             });
         } catch (e) {
             throw new Error('Initializing WombatJS failed: ' + e.toString());