diff --git a/runbot/views/build_error_views.xml b/runbot/views/build_error_views.xml
index a1ee92e9..8d17e499 100644
--- a/runbot/views/build_error_views.xml
+++ b/runbot/views/build_error_views.xml
@@ -155,6 +155,8 @@
           <filter string="Fixing PR is open" name="pr_open_errors" domain="[('fixing_pr_id', '!=', False), ('fixing_pr_id.alive', '=', True)]"/>
           <separator/>
           <filter string="Test Tags" name="test_tagged_errors" domain="[('test_tags', '!=', False)]"/>
+          <separator/>
+          <filter string="Not seen in one month" name="not_seen_one_month" domain="[('last_seen_date','&lt;', (context_today() - datetime.timedelta(days=30)).strftime('%Y-%m-%d'))]"/>
         </search>
       </field>
     </record>