diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 796c0411ef..dff25b6c54 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -87,7 +87,7 @@ OpenLayers.Map.prototype = {
 
         this.updateSize();
         // update the internal size register whenever the div is resized
-        this.events.register("resize", this, updateSize);
+        this.events.register("resize", this, this.updateSize);
 
         this.layers = [];