diff --git a/src/js/features/draggable.js b/src/js/features/draggable.js
index e507806..d167233 100644
--- a/src/js/features/draggable.js
+++ b/src/js/features/draggable.js
@@ -205,10 +205,9 @@ var Draggable = defineClass(
       var mousePosX = mousePos[0];
       var mousePosY = mousePos[1];
       var helperStyle = this.helperElement.style;
-      var pos = this.tree.rootElement.getBoundingClientRect();
 
-      helperStyle.top = mousePosY - pos.top + this.helperPos.y + 'px';
-      helperStyle.left = mousePosX - pos.left + this.helperPos.x + 'px';
+      helperStyle.top = mousePosY + window.pageYOffset + this.helperPos.y + 'px';
+      helperStyle.left = mousePosX + window.pageXOffset + this.helperPos.x + 'px';
       helperStyle.display = '';
     },