diff --git a/feature-detects/css/vwunit.js b/feature-detects/css/vwunit.js
index fb12423e43..0e097b0e94 100644
--- a/feature-detects/css/vwunit.js
+++ b/feature-detects/css/vwunit.js
@@ -13,12 +13,12 @@
   }]
 }
 !*/
-define(['Modernizr', 'docElement', 'testStyles'], function( Modernizr, docElement, testStyles ) {
+define(['Modernizr', 'testStyles'], function( Modernizr, testStyles ) {
   testStyles('#modernizr { width: 50vw; }', function( elem ) {
-    var width = parseInt(docElement.innerWidth/2,10);
+    var width = parseInt(window.innerWidth / 2, 10);
     var compStyle = parseInt((window.getComputedStyle ?
                               getComputedStyle(elem, null) :
-                              elem.currentStyle)['width'],10);
+                              elem.currentStyle).width, 10);
 
     Modernizr.addTest('cssvwunit', compStyle == width);
   });