diff --git a/lib/OpenLayers/Control/MouseDefaults.js b/lib/OpenLayers/Control/MouseDefaults.js
index b40f75f5c2..9a7b8900d8 100644
--- a/lib/OpenLayers/Control/MouseDefaults.js
+++ b/lib/OpenLayers/Control/MouseDefaults.js
@@ -197,9 +197,9 @@ OpenLayers.Control.MouseDefaults.prototype =
         }
         if (delta) {
             if (delta < 0) {
-               this.map.zoomOut();
+               this.defaultWheelDown();
             } else {
-               this.map.zoomIn();
+               this.defaultWheelUp();
             }
         }
     },