diff --git a/app/assets/javascripts/discourse/helpers/application_helpers.js b/app/assets/javascripts/discourse/helpers/application_helpers.js
index c65bf622169..ac21bcae24b 100644
--- a/app/assets/javascripts/discourse/helpers/application_helpers.js
+++ b/app/assets/javascripts/discourse/helpers/application_helpers.js
@@ -289,7 +289,7 @@ Handlebars.registerHelper('number', function(property, options) {
   var result = "<span class='" + classNames + "'";
 
   if (n !== title) {
-    result += " title='" + title + "'";
+    result += " title='" + Handlebars.Utils.escapeExpression(title) + "'";
   }
   result += ">" + n + "</span>";