diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 3f9bad84b6..5468d51c32 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -170,6 +170,7 @@ OpenLayers.Map.prototype = {
     * @param {OpenLayers.Popup} popup
     */
     addPopup: function(popup) {
+        popup.map = this;
         this.popups.push(popup);
         var px = this.getLayerPxFromLonLat(popup.lonlat)
         var popupDiv = popup.draw(px);