diff --git a/lib/OpenLayers/Control/PanZoomBar.js b/lib/OpenLayers/Control/PanZoomBar.js
index 0c220a2c84..a083553311 100644
--- a/lib/OpenLayers/Control/PanZoomBar.js
+++ b/lib/OpenLayers/Control/PanZoomBar.js
@@ -123,6 +123,7 @@ OpenLayers.Control.PanZoomBar.prototype =
             this.slider.style.top = (parseInt(this.slider.style.top)-deltaY)+"px";
             this.mouseDragStart = evt.xy.copyOf();
         }
+        Event.stop(evt);
     },
     zoomBarUp:function(evt) {
         this.div.style.cursor="default";