diff --git a/modoboa/admin/static/admin/js/admin.js b/modoboa/admin/static/admin/js/admin.js
index 0ef78734c..fec5ece1e 100644
--- a/modoboa/admin/static/admin/js/admin.js
+++ b/modoboa/admin/static/admin/js/admin.js
@@ -295,7 +295,7 @@ Domains.prototype = {
 
     optionsform_prefill: function() {
         var $span = $("#id_dom_admin_username").next("span");
-        $span.html("@" + $("#id_name").val());
+        $span.html("@" + htmlEncode($("#id_name").val()));
     },
 
     domadminsform_init: function() {
diff --git a/modoboa/admin/templates/admin/domains.html b/modoboa/admin/templates/admin/domains.html
index 5d354d6bd..d011876f0 100644
--- a/modoboa/admin/templates/admin/domains.html
+++ b/modoboa/admin/templates/admin/domains.html
@@ -13,11 +13,11 @@
   {{ block.super }}
   <script src="{% static 'transport/js/transport.js' %}" type="text/javascript"></script>
   <script type="text/javascript">
-   $(document).ready(function() {
-       admin = new Domains({
-           load_page_url: "{% url 'admin:domain_page' %}"
-       });
-   });
+  $(document).ready(function() {
+      admin = new Domains({
+          load_page_url: "{% url 'admin:domain_page' %}"
+      });
+  });
   </script>
 {% extra_static_content "domains" "js" user %}
 {% endblock %}
diff --git a/modoboa/static/js/global.js b/modoboa/static/js/global.js
index e2062efd2..6d1d1d722 100644
--- a/modoboa/static/js/global.js
+++ b/modoboa/static/js/global.js
@@ -361,6 +361,15 @@ String.prototype.format = function() {
     });
 };
 
+/**
+ * Simple HTML escape function
+ */
+function htmlEncode(str) {
+    return String(str).replace(/[^\w. ]/gi, function(c) {
+        return '&#'+c.charCodeAt(0)+';';
+    });
+}
+
 $(document).ready(function() {
     $(document).ajaxSuccess(function(e, xhr, settings) { ajax_login_redirect(xhr); });
     $(document).ajaxError(defaultAjaxErrorHandler);