lib/PublicInbox/ManifestJsGz.pm | 7 +++++++
 lib/PublicInbox/WWW.pm          | 2 +-

diff --git a/lib/PublicInbox/ManifestJsGz.pm b/lib/PublicInbox/ManifestJsGz.pm
index 6d5b57eebc2e5c31db1496e982b41097f8e415fa..e02450fa6dee5bcd35aab49504f68c7a62a24e90 100644
--- a/lib/PublicInbox/ManifestJsGz.pm
+++ b/lib/PublicInbox/ManifestJsGz.pm
@@ -99,4 +99,11 @@ 		 'Last-Modified', time2str($ctx->{-mtime}),
 		 'Content-Length', bytes::length($out) ], [ $out ] ]
 }
 
+sub per_inbox {
+	my ($ctx) = @_;
+	# only one inbox, slow is probably OK
+	slow_manifest_add($ctx, $ctx->{ibx});
+	psgi_triple($ctx);
+}
+
 1;
diff --git a/lib/PublicInbox/WWW.pm b/lib/PublicInbox/WWW.pm
index a33d25abd44e314b489549a7ea08bb9ad7f4365e..52630ae3eccc4d48c734e9cceca0b587b4f4f7a7 100644
--- a/lib/PublicInbox/WWW.pm
+++ b/lib/PublicInbox/WWW.pm
@@ -505,7 +505,7 @@ 	my ($ctx, $inbox, $key) = @_;
 	my $r404 = invalid_inbox($ctx, $inbox);
 	return $r404 if $r404;
 	require PublicInbox::ManifestJsGz;
-	PublicInbox::ManifestJsGz->response($ctx);
+	PublicInbox::ManifestJsGz::per_inbox($ctx);
 }
 
 sub get_attach {