diff --git a/lib/Lacuna/Web/Admin.pm b/lib/Lacuna/Web/Admin.pm
index f0859aef..455c3c3a 100644
--- a/lib/Lacuna/Web/Admin.pm
+++ b/lib/Lacuna/Web/Admin.pm
@@ -450,7 +450,7 @@ sub www_toggle_isolationist {
 
 sub www_become_empire {
     my ($self, $request, $id) = @_;
-    $id ||= $request->param('id');
+    $id ||= $request->param('empire_id');
     my $empire = Lacuna->db->resultset('Lacuna::DB::Result::Empire')->find($id);
     unless (defined $empire) {
         confess [404, 'Empire not found.'];