diff --git a/lib/Lacuna/Web/EntertainmentVote.pm b/lib/Lacuna/Web/EntertainmentVote.pm
index 21c6681f..6e39126e 100644
--- a/lib/Lacuna/Web/EntertainmentVote.pm
+++ b/lib/Lacuna/Web/EntertainmentVote.pm
@@ -16,6 +16,9 @@ sub www_default {
     unless (defined $empire) {
         confess [401, 'Empire not found.'];
     }
+    if ($empire->current_session->is_sitter) {
+        confess [1015, 'Sitters cannot enter the lottery.'];
+    }
     my $url = $request->param('site_url');
     unless (defined $url) {
         confess [417, 'You need to specify a site.'];