diff --git a/lib/OpenLayers/BaseTypes.js b/lib/OpenLayers/BaseTypes.js
index 0fc0a2889f..5e06a464b5 100644
--- a/lib/OpenLayers/BaseTypes.js
+++ b/lib/OpenLayers/BaseTypes.js
@@ -420,8 +420,8 @@ OpenLayers.Bounds.prototype = {
     * @type OpenLayers.Bounds
     */
     add:function(x, y){
-        return new OpenLayers.Box(this.left + x, this.bottom + y,
-                                  this.right + x, this.top + y);
+        return new OpenLayers.Bounds(this.left + x, this.bottom + y,
+                                     this.right + x, this.top + y);
     },
 
     /**