diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 4aa1de3748..96ada8dbbc 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -394,9 +394,7 @@ OpenLayers.Map.prototype = {
 
             //redraw popups
             for (var i = 0; i < this.popups.length; i++) {
-                var popup = this.popups[i];
-                var px = this.getLayerPxFromLonLat(popup.lonlat);
-                popup.moveTo(px);
+                this.popups[i].updatePosition();
             }
 
         }
diff --git a/lib/OpenLayers/Popup.js b/lib/OpenLayers/Popup.js
index 56e56aea39..7810026966 100644
--- a/lib/OpenLayers/Popup.js
+++ b/lib/OpenLayers/Popup.js
@@ -103,6 +103,17 @@ OpenLayers.Popup.prototype = {
         return this.div;
     },
 
+    /** 
+     * if the popup has a lonlat and its map members set, 
+     *  then have it move itself to its proper position
+     */
+    updatePosition: function() {
+        if ((this.lonlat) && (this.map)) {
+                px = this.map.getLayerPxFromLonLat(this.lonlat);
+                this.moveTo(px);            
+        }
+    },
+
     /**
     * @param {OpenLayers.Pixel} px
     */