diff --git a/lib/OpenLayers/Handler/MouseWheel.js b/lib/OpenLayers/Handler/MouseWheel.js
index c207f2dadb..135edb39a5 100644
--- a/lib/OpenLayers/Handler/MouseWheel.js
+++ b/lib/OpenLayers/Handler/MouseWheel.js
@@ -163,9 +163,6 @@ OpenLayers.Handler.MouseWheel = OpenLayers.Class(OpenLayers.Handler, {
         if (!overScrollableDiv && overMapDiv) {
             if (allowScroll) {
                 var delta = 0;
-                if (!e) {
-                    e = window.event;
-                }
                 
                 if (e.wheelDelta) {
                     delta = e.wheelDelta;