diff --git a/lib/OpenLayers/Popup/Anchored.js b/lib/OpenLayers/Popup/Anchored.js
index 39c45e0384..dcf03f6925 100644
--- a/lib/OpenLayers/Popup/Anchored.js
+++ b/lib/OpenLayers/Popup/Anchored.js
@@ -107,11 +107,7 @@ OpenLayers.Popup.Anchored.prototype =
      * @type OpenLayers.Pixel
      */
     calculateNewPx:function(px) {
-        var newPx = px.copyOf();
-
-        //adjust for offset
-        newPx.offset(this.anchor.offset);
-        
+        var newPx = px.offset(this.anchor.offset);
 
         var top = (this.relativePosition.charAt(0) == 't');
         newPx.y += (top) ? -this.size.h : this.anchor.size.h;