public-inbox-learn | 3 ++-

diff --git a/public-inbox-learn b/public-inbox-learn
index db0a1bb35e5ec8115e007c4dcd8cd12fdee82a70..d3a05abe4cfcb1e17d7d37532343dd756d336961 100755
--- a/public-inbox-learn
+++ b/public-inbox-learn
@@ -60,6 +60,7 @@ 	} else { # $train eq "ham"
 		# no checking for spam here, we assume the message has
 		# been reviewed by a human at this point:
 		PublicInbox::MDA->set_list_headers($mime, $dst);
+		my $s  = $mime->as_string;
 
 		local $ENV{GIT_AUTHOR_NAME} = $name;
 		local $ENV{GIT_AUTHOR_EMAIL} = $email;
@@ -67,7 +68,7 @@ 		local $ENV{GIT_AUTHOR_DATE} = $date;
 
 		# Ham messages are trained when they're marked into
 		# a SEEN state, so this is idempotent:
-		run([PublicInbox::MDA->cmd, $git_dir], \$in, \$out, \$err);
+		run([PublicInbox::MDA->cmd, $git_dir], \$s, \$out, \$err);
 		if ($err !~ /CONFLICT/) {
 			$err = 1;
 		}