diff --git a/web/template/viewer.html b/web/template/viewer.html
index e639b2b..de38b13 100644
--- a/web/template/viewer.html
+++ b/web/template/viewer.html
@@ -30,7 +30,7 @@
   <!-- Chat -->
   <div class="col-chat" id="sideWidget">
     <iframe src="https://irc.crans.org/web/?join=stream_{{.Path}}&nick=viewer&password=&realname=Viewer"
-      title="Chat"></iframe>
+      title="Chat" sandbox="allow-scripts allow-forms allow-same-origin"></iframe>
   </div>
 </div>