diff --git a/lib/OpenLayers/Layer/Bing.js b/lib/OpenLayers/Layer/Bing.js
index 68ea9efd3a..b03b7e6815 100644
--- a/lib/OpenLayers/Layer/Bing.js
+++ b/lib/OpenLayers/Layer/Bing.js
@@ -169,7 +169,8 @@ OpenLayers.Layer.Bing = OpenLayers.Class(OpenLayers.Layer.XYZ, {
         }
         this.addOptions({
             maxResolution: Math.min(
-                this.serverResolutions[res.zoomMin], this.maxResolution
+                this.serverResolutions[res.zoomMin],
+                this.maxResolution || Number.POSITIVE_INFINITY
             ),
             numZoomLevels: Math.min(
                 res.zoomMax + 1 - res.zoomMin, this.numZoomLevels