lib/PublicInbox/Over.pm    | 2 +-
 lib/PublicInbox/OverIdx.pm | 5 ++---

diff --git a/lib/PublicInbox/Over.pm b/lib/PublicInbox/Over.pm
index 6b7d52163028483dfdd4884241e9ef226fa91b34..0957cbdd78cca6290832f93e25b7203977904456 100644
--- a/lib/PublicInbox/Over.pm
+++ b/lib/PublicInbox/Over.pm
@@ -6,7 +6,7 @@ # Unlike Msgmap, this is an _UNSTABLE_ database which can be
 # tweaked/updated over time and rebuilt.
 package PublicInbox::Over;
 use strict;
-use warnings;
+use v5.10.1;
 use DBI;
 use DBD::SQLite;
 use PublicInbox::Smsg;
diff --git a/lib/PublicInbox/OverIdx.pm b/lib/PublicInbox/OverIdx.pm
index 512c5f463f008f0c3e3532ccd803e2d7ca54fc69..67f8cf656958d78440ba13e7115915065021cacf 100644
--- a/lib/PublicInbox/OverIdx.pm
+++ b/lib/PublicInbox/OverIdx.pm
@@ -9,14 +9,13 @@ # Ghost messages (messages which are only referenced in References/In-Reply-To)
 # are denoted by a negative NNTP article number.
 package PublicInbox::OverIdx;
 use strict;
-use warnings;
-use base qw(PublicInbox::Over);
+use v5.10.1;
+use parent qw(PublicInbox::Over);
 use IO::Handle;
 use DBI qw(:sql_types); # SQL_BLOB
 use PublicInbox::MID qw/id_compress mids_for_index references/;
 use PublicInbox::Smsg qw(subject_normalized);
 use Compress::Zlib qw(compress);
-use PublicInbox::Search;
 use Carp qw(croak);
 
 sub dbh_new {