diff --git a/lib/OpenLayers/Layer/Boxes.js b/lib/OpenLayers/Layer/Boxes.js
index 073befb19f..d63a7f8b1c 100644
--- a/lib/OpenLayers/Layer/Boxes.js
+++ b/lib/OpenLayers/Layer/Boxes.js
@@ -33,7 +33,8 @@ OpenLayers.Layer.Boxes.prototype =
             marker.display(false);
         } else {
             var sz = new OpenLayers.Size(
-                botright.x - topleft.x, botright.y - topleft.y);
+                Math.max(1, botright.x - topleft.x),
+                Math.max(1, botright.y - topleft.y));
             var markerDiv = marker.draw(topleft, sz);
             if (!marker.drawn) {
                 this.div.appendChild(markerDiv);