diff --git a/templates/rbmd/index.html b/templates/rbmd/index.html
index 712340b..20f238c 100644
--- a/templates/rbmd/index.html
+++ b/templates/rbmd/index.html
@@ -85,6 +85,7 @@
   </body>
   <script>
     var ws = new WebSocket('{{escape(ws)}}');
+    var cluster;
     // var cluster, selected_node, deadNode, node2;
     ws.onopen = function() {ws.send(""); };
     ws.onmessage = function (evt) {