lib/PublicInbox/Eml.pm     | 2 +-
 lib/PublicInbox/MsgIter.pm | 2 +-
 t/eml.t                    | 2 +-

diff --git a/lib/PublicInbox/Eml.pm b/lib/PublicInbox/Eml.pm
index d2bd391554566d2e7939dfea36141e8660e013f5..ec682b919eab0d796d6d49089f94ed594a00f2f8 100644
--- a/lib/PublicInbox/Eml.pm
+++ b/lib/PublicInbox/Eml.pm
@@ -237,7 +237,7 @@ # $once - unref body scalar during iteration
 sub each_part {
 	my ($self, $cb, $arg, $once, $all) = @_;
 	my $p = mp_descend($self, $once // 0) or
-					return $cb->([$self, 0, 0], $arg);
+					return $cb->([$self, 0, 1], $arg);
 
 	$cb->([$self, 0, 0], $arg) if ($all || $self->{-call_cb}); # rare
 
diff --git a/lib/PublicInbox/MsgIter.pm b/lib/PublicInbox/MsgIter.pm
index 5ec2a4d9c7f1d3e06f76d4c4abb639ddacb00ac4..bb1dfeadc291857f993b68dd297da46de3a9728c 100644
--- a/lib/PublicInbox/MsgIter.pm
+++ b/lib/PublicInbox/MsgIter.pm
@@ -34,7 +34,7 @@ 				$cb->($p, $cb_arg);
 			}
 		}
 	} else {
-		$cb->([$mime, 0, 0], $cb_arg);
+		$cb->([$mime, 0, 1], $cb_arg);
 	}
 }
 
diff --git a/t/eml.t b/t/eml.t
index a2479f6f068187071d35cc441679eb012b06eb70..8d131b1418eb7c510b55297ef2cbeed4632fd038 100644
--- a/t/eml.t
+++ b/t/eml.t
@@ -169,7 +169,7 @@ EOF
 	is(scalar(@tmp), 1, 'got one part even w/o boundary');
 	is($tmp[0]->[0]->[0]->body, "hello world\n", 'body preserved');
 	is($tmp[0]->[0]->[1], 0, '$depth is zero');
-	is($tmp[0]->[0]->[2], 0, '@idx is zero');
+	is($tmp[0]->[0]->[2], 1, '@idx is one');
 }
 
 # I guess the following only worked in PI::M because of a happy accident