diff --git a/lib/browser/client-scripts/polyfills/getComputedStyle.js b/lib/browser/client-scripts/polyfills/getComputedStyle.js
index 180f5836f..a07888fd9 100644
--- a/lib/browser/client-scripts/polyfills/getComputedStyle.js
+++ b/lib/browser/client-scripts/polyfills/getComputedStyle.js
@@ -109,6 +109,9 @@ CSSStyleDeclaration.prototype = {
 };
 
 	// <Global>.getComputedStyle
-exports.getComputedStyle = function getComputedStyle(element) {
-    return new CSSStyleDeclaration(element);
+exports.getComputedStyle = function getComputedStyle(element, pseudoEl) {
+    // IE9 needs matchMedia support but already support getComputedStyle
+    return window.getComputedStyle
+        ? window.getComputedStyle(element, pseudoEl)
+        : new CSSStyleDeclaration(element);
 };