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-rw-r--r--lib/PublicInbox/LeiRediff.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/LeiRediff.pm b/lib/PublicInbox/LeiRediff.pm
index f0521bcc..c312d90f 100644
--- a/lib/PublicInbox/LeiRediff.pm
+++ b/lib/PublicInbox/LeiRediff.pm
@@ -256,7 +256,7 @@ sub lei_rediff {
         ($lei->{opt}->{drq} && !$lei->{opt}->{verbose}) and
                 $lei->{opt}->{quiet} //= 1;
         $lei->_lei_store(1)->write_prepare($lei);
-        $lei->{opt}->{'in-format'} //= 'eml';
+        $lei->{opt}->{'in-format'} //= 'eml' if $lei->{opt}->{stdin};
         # maybe it's a non-email (code) blob from a coderepo
         my $git_dirs = $lei->{opt}->{'git-dir'} //= [];
         if ($lei->{opt}->{cwd} // 1) {