diff --git a/lib/OpenLayers/Util.js b/lib/OpenLayers/Util.js
index 582daa253c..33593db087 100644
--- a/lib/OpenLayers/Util.js
+++ b/lib/OpenLayers/Util.js
@@ -685,7 +685,7 @@ OpenLayers.Util.createImage = function(img, sz, xy, position, id, border) {
 OpenLayers.Util.createAlphaImageDiv = function(imgURL, sz, px, position, 
                                                id, border, divSz) {
 
-    var div = OpenLayers.Util.createDiv(id, px, (divSz ? divSz : sz));
+    var div = OpenLayers.Util.createDiv(id, px, (divSz == null ? sz : divSz));
     var img = OpenLayers.Util.createImage(imgURL, sz, null, "relative",
                                                id + "_innerImage", border);
     div.appendChild(img);