diff --git a/website/canvas/event-propagators-with-device-gravity.html b/website/canvas/event-propagators-with-device-gravity.html
index 9630cc7..88e838d 100644
--- a/website/canvas/event-propagators-with-device-gravity.html
+++ b/website/canvas/event-propagators-with-device-gravity.html
@@ -35,7 +35,7 @@
     </style>
   </head>
   <body>
-    <button onclick="enableGravity">Enable Gravity</button>
+    <button onclick="enableGravity()">Enable Gravity</button>
     <folk-shape id="box1" x="100" y="100" width="30" height="30"></folk-shape>
     <folk-shape id="box2" x="200" y="350">Hello World</folk-shape>
     <folk-event-propagator
