diff --git a/demo.html b/demo.html
index b960532..7a17bea 100644
--- a/demo.html
+++ b/demo.html
@@ -41,7 +41,7 @@
 
   <paper-progress></paper-progress>
 
-  <paper-button raisedButton onclick="startProgress();">Start</paper-button>
+  <paper-button raisedButton label="Start" onclick="startProgress();"></paper-button>
   
   <br><br><br>