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-rw-r--r--lib/PublicInbox/V2Writable.pm3
1 files changed, 1 insertions, 2 deletions
diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 20c27363..b04e6fbf 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -173,8 +173,7 @@ sub num_for_harder {
                         $num = $self->{skel}->{mm}->mid_insert($$mid0);
                 }
         }
-        my @cur = $hdr->header_raw('Message-Id');
-        $hdr->header_set('Message-Id', "<$$mid0>", @cur);
+        PublicInbox::Import::prepend_mid($hdr, $$mid0);
         $num;
 }