diff --git a/lib/browser.js b/lib/browser.js
index 0d790bc..f997f20 100644
--- a/lib/browser.js
+++ b/lib/browser.js
@@ -45,7 +45,7 @@ var round = function(n){
 var compute = global.getComputedStyle ? function(node){
     var cts = getComputedStyle(node, null)
     return function(property){
-        return cts ? cts.getPropertyValue(hyphenate(property)) : ""
+        return cts && cts.getPropertyValue(hyphenate(property)) ? cts.getPropertyValue(hyphenate(property)) : ""
     }
 } : /*(css3)?*/function(node){
     var cts = node.currentStyle