diff --git a/lib/OpenLayers/Control/PanZoomBar.js b/lib/OpenLayers/Control/PanZoomBar.js
index 05e3bb8378..64f684915f 100644
--- a/lib/OpenLayers/Control/PanZoomBar.js
+++ b/lib/OpenLayers/Control/PanZoomBar.js
@@ -106,7 +106,8 @@ OpenLayers.Control.PanZoomBar.prototype =
 
         this.map.events.register("zoomend", this, this.moveZoomBar);
 
-        centered = centered.add(0, zoomStopSize*(this.map.getZoomLevels()+1));
+        centered = centered.add(0, 
+            this.zoomStopHeight*(this.map.getZoomLevels()+1));
         return centered; 
     },
     /*