diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 6eb0b70e59..525cfe2fc1 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -379,5 +379,7 @@ OpenLayers.Map.prototype = {
     defaultMouseUp: function (evt) {
         this.mouseDragStart = null;
         this.div.style.cursor = "default";
-    }
+    },
+
+    CLASS_NAME: "OpenLayers.Map"
 };