lib/PublicInbox/Import.pm | 2 +-
 lib/PublicInbox/MID.pm    | 4 ++--

diff --git a/lib/PublicInbox/Import.pm b/lib/PublicInbox/Import.pm
index 95d654f667221711de6897ffd632b197bd6d10cf..de8ff55f4abd9c23c7b0be5bfe888a15f348fd40 100644
--- a/lib/PublicInbox/Import.pm
+++ b/lib/PublicInbox/Import.pm
@@ -354,7 +354,7 @@ 	my ($mime) = @_;
 	my $hdr = $mime->header_obj;
 	my $mids = mids($hdr);
 
-	if (!scalar(@$mids)) { # spam often has no Message-Id
+	if (!scalar(@$mids)) { # spam often has no Message-ID
 		my $mid0 = digest2mid(content_digest($mime), $hdr);
 		append_mid($hdr, $mid0);
 		return $mid0;
diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index dddde092f2581ea1d54b1749804642dbccf89a48..685306dbf37658356b9cb7572c1ab04bbba46d50 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -72,7 +72,7 @@ }
 
 sub mids ($) {
 	my ($hdr) = @_;
-	my @mids = $hdr->header_raw('Message-Id');
+	my @mids = $hdr->header_raw('Message-ID');
 	uniq_mids(extract_mids(@mids));
 }
 
@@ -81,7 +81,7 @@ # to placate some clients, and we want to ensure NNTP-only clients can
 # import and index without relying on HTTP endpoints
 sub mids_for_index ($) {
 	my ($hdr) = @_;
-	my @mids = $hdr->header_raw('Message-Id');
+	my @mids = $hdr->header_raw('Message-ID');
 	my @alts = $hdr->header_raw('X-Alt-Message-ID');
 	uniq_mids(extract_mids(@mids, @alts));
 }