diff --git a/lib/OpenLayers/Popup.js b/lib/OpenLayers/Popup.js
index 2955766608..cc6cdea37d 100644
--- a/lib/OpenLayers/Popup.js
+++ b/lib/OpenLayers/Popup.js
@@ -694,7 +694,7 @@ OpenLayers.Popup = OpenLayers.Class({
             }
 
             OpenLayers.Event.stopObserving(
-                this.img, "load", this.img._onImageLoad
+                this.img, "load", this.img._onImgLoad
             );
     
         };