diff --git a/app/views/hooks/_silencer_suppress_mail.html.erb b/app/views/hooks/_silencer_suppress_mail.html.erb
index b587b50..d86725e 100644
--- a/app/views/hooks/_silencer_suppress_mail.html.erb
+++ b/app/views/hooks/_silencer_suppress_mail.html.erb
@@ -4,7 +4,7 @@
   <% end %>
   <p>
     <%= hidden_field_tag 'suppress_mail', '0', :id => nil %>
-    <%= check_box_tag 'suppress_mail' %>
+    <%= check_box_tag 'suppress_mail', 1, true %>
     <%= label_tag 'suppress_mail', l(:label_silencer_suppress_mail) %>
   </p>
 <% end %>