diff --git a/tools/props.html b/tools/props.html
index 576e1436..f7c777aa 100644
--- a/tools/props.html
+++ b/tools/props.html
@@ -3,7 +3,7 @@
   </head>
   <body>
     <script>(function(){
-      var props = Object.create(null);
+      var props = {};
 
       function addObject(obj) {
         if (obj == null) return;
