diff --git a/lib/OpenLayers/Events.js b/lib/OpenLayers/Events.js
index 4b0dda5b5d..4a9f703038 100644
--- a/lib/OpenLayers/Events.js
+++ b/lib/OpenLayers/Events.js
@@ -854,7 +854,18 @@ OpenLayers.Events = OpenLayers.Class({
     clearMouseCache: function() { 
         this.element.scrolls = null;
         this.element.lefttop = null;
-        this.element.offsets = null;
+        // OpenLayers.Util.pagePosition needs to use
+        // element.getBoundingClientRect to correctly calculate the offsets
+        // for the iPhone, but once the page is scrolled, getBoundingClientRect
+        // returns incorrect offsets. So our best bet is to not invalidate the
+        // offsets once we have them, and hope that the page was not scrolled
+        // when we did the initial calculation.
+        if (!((document.body.scrollTop != 0 ||
+                                document.body.scrollLeft != 0) &&
+                                navigator.userAgent.match(/iPhone/i))) {
+            OpenLayers.Console.log("clear");
+            this.element.offsets = null;
+        }
     },      
 
     /**