diff --git a/instances/templates/allinstances_index_grouped.html b/instances/templates/allinstances_index_grouped.html
index 2e129c2..6efc0c9 100644
--- a/instances/templates/allinstances_index_grouped.html
+++ b/instances/templates/allinstances_index_grouped.html
@@ -127,7 +127,7 @@
 function hide_host_instances(host) {
     var rows = $('table tr');
 
-    host_rows = rows.filter('[host='+host+']');
+    host_rows = rows.filter("[host='"+host+"']");
     host_rows.toggle();
     $('span#collapse_host_instances_'+host).toggleClass("glyphicon-chevron-down").toggleClass("glyphicon-chevron-up");
 }