diff --git a/conntrackt/templates/admin/conntrackt/communication/change_list.html b/conntrackt/templates/admin/conntrackt/communication/change_list.html
--- a/conntrackt/templates/admin/conntrackt/communication/change_list.html
+++ b/conntrackt/templates/admin/conntrackt/communication/change_list.html
@@ -7,7 +7,7 @@
             <li>
               {# Add the GET parameters from the admin's filter to 'Add entity' button #}
               {# so we can perform some filtering on source/destination interfaces. #}
-              <a href="{% url cl.opts|admin_urlname:'add' %}?{% if is_popup %}_popup=1{% endif %}{% if 'location' in cl.params %}&location={{ cl.params.location }}{% endif %}{% if 'project' in cl.params %}&project={{ cl.params.project }}{% endif %}" class="addlink">
+              <a href="{% url cl.opts|admin_urlname:'add' %}?{% if is_popup %}_popup=1{% endif %}{% if 'location' in cl.params %}&amp;location={{ cl.params.location }}{% endif %}{% if 'project' in cl.params %}&amp;project={{ cl.params.project }}{% endif %}" class="addlink">
                 {% blocktrans with cl.opts.verbose_name as name %}Add {{ name }}{% endblocktrans %}
               </a>
             </li>