diff --git a/calendar/templates/month_detailed.mustache b/calendar/templates/month_detailed.mustache
index d5dbfa4af1b..ffb6e85c694 100644
--- a/calendar/templates/month_detailed.mustache
+++ b/calendar/templates/month_detailed.mustache
@@ -46,7 +46,7 @@
         <thead>
             <tr>
                 {{# daynames }}
-                <th class="header text-xs-center">
+                <th class="header text-xs-center" aria-label="{{fullname}}">
                     {{shortname}}
                 </th>
                 {{/ daynames }}