lib/PublicInbox/LeiMirror.pm | 2 +-

diff --git a/lib/PublicInbox/LeiMirror.pm b/lib/PublicInbox/LeiMirror.pm
index 1dbd4d0a36996ade295218ed6dc23449d3a3d129..ed8e4842c453336a3f96fe5c914262d31dbf5110 100644
--- a/lib/PublicInbox/LeiMirror.pm
+++ b/lib/PublicInbox/LeiMirror.pm
@@ -402,7 +402,7 @@ 	} elsif (defined $v1_path) {
 		clone_v1($self);
 	} else {
 		die "E: confused by <$uri>, possible matches:\n\t",
-			join(', ', sort keys %$m), "\n";
+			join("\n\t", sort keys %$m), "\n";
 	}
 	if (delete $self->{-culled_manifest}) { # set by clone_v2
 		# write the smaller manifest if epochs were skipped so