diff --git a/src/ol/dom.js b/src/ol/dom.js
index 93b08c0fce..2d2a672bd9 100644
--- a/src/ol/dom.js
+++ b/src/ol/dom.js
@@ -28,7 +28,7 @@ ol.dom.createCanvasContext2D = function(opt_width, opt_height) {
  */
 ol.dom.outerWidth = function(element) {
   var width = element.offsetWidth;
-  var style = element.currentStyle || getComputedStyle(element);
+  var style = getComputedStyle(element);
   width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);
 
   return width;
@@ -44,7 +44,7 @@ ol.dom.outerWidth = function(element) {
  */
 ol.dom.outerHeight = function(element) {
   var height = element.offsetHeight;
-  var style = element.currentStyle || getComputedStyle(element);
+  var style = getComputedStyle(element);
   height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);
 
   return height;