diff --git a/lib/OpenLayers/BaseTypes.js b/lib/OpenLayers/BaseTypes.js
index f342f69ac7..1b426f5c1b 100644
--- a/lib/OpenLayers/BaseTypes.js
+++ b/lib/OpenLayers/BaseTypes.js
@@ -31,8 +31,9 @@ OpenLayers.Class = {
             //  so the util.extend() doesnt copy it over. we do it manually.
             // 
             // to be revisited in 3.0
-            // 
-            if (arguments[i].hasOwnProperty('toString')) {
+            //
+            if((arguments[i].hasOwnProperty && arguments[i].hasOwnProperty('toString')) ||
+               (!arguments[i].hasOwnProperty && arguments[i].toString)) {
                 proto.toString = arguments[i].toString;
             }
         }