diff --git a/runbot/runbot.py b/runbot/runbot.py
index 6cb638a6..d6ddd740 100644
--- a/runbot/runbot.py
+++ b/runbot/runbot.py
@@ -1406,6 +1406,7 @@ class RunbotController(http.Controller):
             'port': real_build.port,
             'subject': build.subject,
             'server_match': real_build.server_match,
+            'duplicate_of': build.duplicate_id if build.state == 'duplicate' else False,
         }
 
     @http.route(['/runbot/build/<build_id>'], type='http', auth="public", website=True)
diff --git a/runbot/runbot.xml b/runbot/runbot.xml
index bdb46bb4..3516b15b 100644
--- a/runbot/runbot.xml
+++ b/runbot/runbot.xml
@@ -604,6 +604,7 @@
                             Author: <t t-esc="build['author']"/><br/>
                             Committer: <t t-esc="build['committer']"/><br/>
                         </p>
+                        <p t-if="build['duplicate_of']">Duplicate of <a t-attf-href="/runbot/build/#{build['duplicate_of'].id}"><t t-esc="build['duplicate_of'].dest"/></a></p>
                         <table class="table table-condensed table-striped">
                         <tr>
                             <th>Date</th>