diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index fe10963a69..b2c317e4e1 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -151,7 +151,7 @@ OpenLayers.Map.prototype = {
     * @param {OpenLayers.Popup} popup
     */
     addPopup: function(popup) {
-        popup.map = this;
+        popup.parent = this.viewPortDiv;
         this.popups.push(popup);
         var popupDiv = popup.draw();
         if (popupDiv) {