diff --git a/lib/torque/renderer/rectangle.js b/lib/torque/renderer/rectangle.js
index b9bc4b1..d61be59 100644
--- a/lib/torque/renderer/rectangle.js
+++ b/lib/torque/renderer/rectangle.js
@@ -24,7 +24,7 @@ torque.extend(PixelRenderer.prototype, PointRenderer.prototype, {
       return {
         width: st['marker-width'],
         color: st['marker-fill'],
-        fill_opacity: st['marker-fill-opacity']
+        fill_opacity: st['marker-fill-opacity'] === undefined ? 1.0: st['marker-fill-opacity']
       }
     },