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-rw-r--r--lib/PublicInbox/V2Writable.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 6d738278..c73d859b 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -142,7 +142,7 @@ sub num_for_harder {
                 }
         }
         my @cur = $hdr->header_raw('Message-Id');
-        $hdr->header_set('Message-Id', @cur, "<$mid>");
+        $hdr->header_set('Message-Id', "<$mid>", @cur);
         $num;
 }