lib/PublicInbox/Feed.pm | 4 ++++
 t/cgi.t                 | 1 -

diff --git a/lib/PublicInbox/Feed.pm b/lib/PublicInbox/Feed.pm
index 75e5d9532de3e7f0a21ec9344487b3c35b18e2aa..16b860cbde641baee0cdf9bb7dbee9b7c4a948a4 100644
--- a/lib/PublicInbox/Feed.pm
+++ b/lib/PublicInbox/Feed.pm
@@ -56,6 +56,10 @@ 	each_recent_blob($max, sub {
 		my $str = `git cat-file blob $_[0]`;
 		return 0 if $? != 0;
 		my $simple = Email::Simple->new($str);
+		if ($top && ($simple->header("In-Reply-To") ||
+		             $simple->header("References"))) {
+			return 0;
+		}
 		$simple->body_set(""); # save some memory
 		push @messages, $simple;
 		1;
diff --git a/t/cgi.t b/t/cgi.t
index c8755541211ffd3757480ba8b519a851a17e0831..91efca50a58a63c90fd90e81f8b859c9e6137f52 100644
--- a/t/cgi.t
+++ b/t/cgi.t
@@ -134,7 +134,6 @@ 	my $reply = Email::Simple->new(<<EOF);
 From: You <you\@example.com>
 To: Me <me\@example.com>
 Cc: $addr
-In-Reply-To: <blah\@example.com>
 Message-Id: <$slashy_mid>
 Subject: Re: hihi
 Date: Thu, 01 Jan 1970 00:00:01 +0000