diff --git a/src/event.js b/src/event.js
index 73abcbb52..0c12b0373 100644
--- a/src/event.js
+++ b/src/event.js
@@ -119,7 +119,7 @@
 
   var returnTrue = function(){return true},
       returnFalse = function(){return false},
-      ignoreProperties = /^([A-Z]|returnValue$|layer[XY]$)/,
+      ignoreProperties = /^([A-Z]|returnValue$|layer[XY]$|webkitMovement[XY]$)/,
       eventMethods = {
         preventDefault: 'isDefaultPrevented',
         stopImmediatePropagation: 'isImmediatePropagationStopped',