script/public-inbox-index | 4 +++-

diff --git a/script/public-inbox-index b/script/public-inbox-index
index c68f922447293bb0b43782e7795d57e9c7387ba0..0fdfddc06205cf63a64330ef3e5b375536d3674e 100755
--- a/script/public-inbox-index
+++ b/script/public-inbox-index
@@ -84,8 +84,10 @@ 		$topdir = $es->{topdir};
 	} else {
 		die "extindex `$ei_name' not configured or found\n";
 	}
+	my $o = { %$opt };
+	delete $o->{indexlevel} if ($o->{indexlevel}//'') eq 'basic';
 	$eidx_seen{$topdir} //=
-		push(@eidx, PublicInbox::ExtSearchIdx->new($topdir, $opt));
+		push(@eidx, PublicInbox::ExtSearchIdx->new($topdir, $o));
 }
 my $mods = {};
 my @eidx_unconfigured;