lib/PublicInbox/ContentId.pm | 3 +--
 lib/PublicInbox/OverIdx.pm   | 3 +--

diff --git a/lib/PublicInbox/ContentId.pm b/lib/PublicInbox/ContentId.pm
index 0c4a8678beb02fa4db436ca12c55eda6bc0edc79..65691593abfcc36cb3cafef29420d627b84d07d6 100644
--- a/lib/PublicInbox/ContentId.pm
+++ b/lib/PublicInbox/ContentId.pm
@@ -64,8 +64,7 @@ 	# do NOT consider the Message-ID as part of the content_id
 	# if we got here, we've already got Message-ID reuse
 	my %seen = map { $_ => 1 } @{mids($hdr)};
 	foreach my $mid (@{references($hdr)}) {
-		next if $seen{$mid};
-		$dig->add("ref\0$mid\0");
+		$dig->add("ref\0$mid\0") unless $seen{$mid}++;
 	}
 
 	# Only use Sender: if From is not present
diff --git a/lib/PublicInbox/OverIdx.pm b/lib/PublicInbox/OverIdx.pm
index 189bd21d93bc6731192dd26a333cc79f04b89c3e..5f1007aa68767979cdc8dd0c9a2d8cd34dc886ae 100644
--- a/lib/PublicInbox/OverIdx.pm
+++ b/lib/PublicInbox/OverIdx.pm
@@ -230,8 +230,7 @@ 		if (length($ref) > PublicInbox::MID::MAX_MID_SIZE) {
 			warn "References: <$ref> too long, ignoring\n";
 			next;
 		}
-		next if $seen{$ref}++;
-		push @keep, $ref;
+		push(@keep, $ref) unless $seen{$ref}++;
 	}
 	$smsg->{references} = '<'.join('> <', @keep).'>' if @keep;
 	\@keep;