diff --git a/lib/OpenLayers/Icon.js b/lib/OpenLayers/Icon.js
index d9c58a952d..2c3d8cb9ef 100644
--- a/lib/OpenLayers/Icon.js
+++ b/lib/OpenLayers/Icon.js
@@ -39,8 +39,12 @@ OpenLayers.Icon.prototype = {
     initialize: function(url, size, offset, calculateOffset) {
         this.url = url;
         this.size = (size) ? size : new OpenLayers.Size(20,20);
-        this.offset = (offset) ? offset : new OpenLayers.Pixel(0,0);
-        this.calculateOffset = calculateOffset;
+        this.offset = offset;
+        this.calculateOffset = (calculateOffset) ? calculateOffset
+                                 : function(size) {
+                                     return new OpenLayers.Pixel(-(size.w/2), 
+                                                                -(size.h/2));
+                                   };
 
         this.imageDiv = OpenLayers.Util.createAlphaImageDiv();
     },