diff --git a/ti/static/ti/cv.js b/ti/static/ti/cv.js
index f5fbfb6e0a1ac5f43fac210eb57720343348a0db..5a4d8b3aacf78a955a9e952527d85721f56aca22 100644
--- a/ti/static/ti/cv.js
+++ b/ti/static/ti/cv.js
@@ -95,7 +95,7 @@
 
   function getPosition(event){
       var bound = canvas.getBoundingClientRect();
-      var x = (event.pageX - bound.left) * (canvas.width / bound.width);
-      var y = (event.pageY - bound.top) * (canvas.height / bound.height);
+      var x = (event.x - bound.left) * (canvas.width / bound.width);
+      var y = (event.y - bound.top) * (canvas.height / bound.height);
       return {X: x, Y: y};
   }