diff --git a/lib/OpenLayers/Control/OverviewMap.js b/lib/OpenLayers/Control/OverviewMap.js
index 9755b4082a..1e0c4ed6a5 100644
--- a/lib/OpenLayers/Control/OverviewMap.js
+++ b/lib/OpenLayers/Control/OverviewMap.js
@@ -434,7 +434,8 @@ OpenLayers.Control.OverviewMap = OpenLayers.Class(OpenLayers.Control, {
     createMap: function() {
         // create the overview map
         var options = OpenLayers.Util.extend(
-                        {controls: [], maxResolution: 'auto'}, this.mapOptions);
+                        {controls: [], maxResolution: 'auto', 
+                         fallThrough: false}, this.mapOptions);
         this.ovmap = new OpenLayers.Map(this.mapDiv, options);
         
         // prevent ovmap from being destroyed when the page unloads, because