diff --git a/app/templates/package.html b/app/templates/package.html
index eadac3c..8bbce85 100644
--- a/app/templates/package.html
+++ b/app/templates/package.html
@@ -209,7 +209,7 @@
       <dd class="col-sm-9">
         {% if p.provided_by %}
             <ul class="list-unstyled">
-                {% for p in p.provided_by|sort %}
+                {% for p in p.provided_by|sort(attribute='key') %}
                     <li><a href="{{ package_url(p) }}">{{ p.name }}</a> </li>
                 {% endfor %}
             </ul>