diff --git a/lib/OpenLayers/Icon.js b/lib/OpenLayers/Icon.js
index dfa11f4555..c6e02a33d1 100644
--- a/lib/OpenLayers/Icon.js
+++ b/lib/OpenLayers/Icon.js
@@ -27,7 +27,7 @@ OpenLayers.Icon.prototype = {
         this.url = url;
 
         this.offset = offset;
-        if (offset == null) {
+        if ((size != null) && (offset == null)) {
             // default offset
             this.offset = new OpenLayers.Pixel(-(size.w / 2), -size.h);
         }