script/public-inbox-extindex | 2 ++

diff --git a/script/public-inbox-extindex b/script/public-inbox-extindex
index 864a27327e5a70b80a75cb852e423baad78da9a2..5d56e2c31ff5e8ac13e7de5eae9c19640832c352 100644
--- a/script/public-inbox-extindex
+++ b/script/public-inbox-extindex
@@ -39,6 +39,8 @@ my $cfg = PublicInbox::Config->new;
 my @ibxs = PublicInbox::Admin::resolve_inboxes(\@ARGV, $opt, $cfg);
 PublicInbox::Admin::require_or_die(qw(-search));
 PublicInbox::Admin::progress_prepare($opt);
+my $env = PublicInbox::Admin::index_prepare($opt, $cfg);
+local %ENV = (%ENV, %$env) if $env;
 require PublicInbox::ExtSearchIdx;
 my $eidx = PublicInbox::ExtSearchIdx->new($eidx_dir, $opt);
 $eidx->attach_inbox($_) for @ibxs;