diff --git a/lib/OpenLayers/Map.js b/lib/OpenLayers/Map.js
index 3269d6574c..1395173a76 100644
--- a/lib/OpenLayers/Map.js
+++ b/lib/OpenLayers/Map.js
@@ -806,7 +806,9 @@ OpenLayers.Map.prototype = {
      * @param {int} zoom
      */
     zoomTo: function(zoom) {
-        this.setCenter(null, zoom);
+        if (this.isValidZoomLevel(zoom)) {
+            this.setCenter(null, zoom);
+        }
     },
     
     /**