diff --git a/app/views/sessions/new.html.erb b/app/views/sessions/new.html.erb
index 89a00cb67..f1fc9d06c 100644
--- a/app/views/sessions/new.html.erb
+++ b/app/views/sessions/new.html.erb
@@ -15,7 +15,7 @@
               </label>
 
               <div class="controls">
-                <%= f.text_field :username, :required => true, :pattern => "[A-Za-z0-9_]+", :autocapitalize => "off", :autocorrect => "off" %>
+                <%= f.text_field :username, :required => true, :pattern => "[A-Za-z0-9_.@\-]+", :autocapitalize => "off", :autocorrect => "off" %>
               </div>
           </div>