diff --git a/lib/OpenLayers/Control/PanZoomBar.js b/lib/OpenLayers/Control/PanZoomBar.js
index 410cca543c..4447e2dc28 100644
--- a/lib/OpenLayers/Control/PanZoomBar.js
+++ b/lib/OpenLayers/Control/PanZoomBar.js
@@ -375,6 +375,7 @@ OpenLayers.Control.PanZoomBar = OpenLayers.Class(OpenLayers.Control.PanZoom, {
             }
             this.map.zoomTo(zoomLevel);
             this.mouseDragStart = null;
+            this.zoomStart = null;
             OpenLayers.Event.stop(evt);
         }
     },