diff --git a/ti/static/ti/cv.js b/ti/static/ti/cv.js
index 3b3f45688bbb67712836dde7c6af8317db994f3b..3e6a12aa5d1d7aa01132ebda932c28337279a807 100644
--- a/ti/static/ti/cv.js
+++ b/ti/static/ti/cv.js
@@ -94,7 +94,7 @@ ctx.stroke();
   }
 
   function getPosition(event){
-      var x = event.pageX - canvas.offsetLeft;
-      var y = event.pageY - canvas.offsetTop;
+      var x = event.x;
+      var y = event.y;
       return {X: x, Y: y};
   }