diff --git a/app/views/layouts/_mailbot_header.html.erb b/app/views/layouts/_mailbot_header.html.erb
index 343af234..96beec33 100644
--- a/app/views/layouts/_mailbot_header.html.erb
+++ b/app/views/layouts/_mailbot_header.html.erb
@@ -14,7 +14,7 @@
       <div class="row">
         <div class="col-md-2">
           <% if @logo.present? %>
-            <%= image_tag(@logo, style: "display:block") %>
+            <%= image_tag(@logo, style: "display:block", alt: 'conference logo') %>
           <% end %>
         </div>
         <div class="col-md-10">