diff --git a/lib/infobox/node.js b/lib/infobox/node.js
index d4e8d4e..ff267ae 100644
--- a/lib/infobox/node.js
+++ b/lib/infobox/node.js
@@ -238,7 +238,7 @@ define(["moment", "numeral", "tablesort", "tablesort.number", "moment.de"],
     function showStatImg(o, d) {
       var subst = {};
       subst["{NODE_ID}"] = d.nodeinfo.node_id ? d.nodeinfo.node_id : "unknown";
-      subst["{NODE_NAME}"] = d.nodeinfo.hostname ? d.nodeinfo.hostname : "unknown";
+      subst["{NODE_NAME}"] = d.nodeinfo.hostname ? d.nodeinfo.hostname.replace(/[^a-z0-9\-]/ig, '_') : "unknown";
       return showStat(o, subst);
     }