diff --git a/web/viewer.js b/web/viewer.js
index 9da0b498d..bb7b0ed01 100644
--- a/web/viewer.js
+++ b/web/viewer.js
@@ -28,7 +28,6 @@ var Cache = function cacheCache(size) {
 
 var RenderingQueue = (function RenderingQueueClosure() {
   function RenderingQueue() {
-    this.busy = false;
     this.items = [];
   }