diff --git a/templates/index.html b/templates/index.html
index c45d6e9..4c57cab 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -47,7 +47,7 @@
         <li><a onclick="editor.raussendorf()">Raussendorf</a></li>
         <li><a onclick="share()">Share</a></li>
         <li><a href="/{{uuid}}/download">Download</a></li>
-        <li><input id=curvy type="checkbox"></input> Curved edges</li>
+        <li><input id=curvy type="checkbox" checked></input> Curved edges</li>
         <li><a href="/doc" id=help>Documentation</a></li>
     </ul>
 </div>