lib/PublicInbox/MID.pm | 3 ++-

diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index 422902f53bed43ab31fff3d93e817adf3d94f441..117d3c42f987e1fc2079cbccd2025f0176194085 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -50,7 +50,8 @@ 	}
 	"$x2/$x38";
 }
 
-sub mid_mime ($) { $_[0]->header_obj->header_raw('Message-ID') }
+# Only for v1 code paths:
+sub mid_mime ($) { mids($_[0]->header_obj)->[0] }
 
 sub mids ($) {
 	my ($hdr) = @_;