lib/PublicInbox/DS.pm | 1 -

diff --git a/lib/PublicInbox/DS.pm b/lib/PublicInbox/DS.pm
index 68af4d65f2786e8e44cb99e0e318527174f0807a..d73c8d0108b7d9070b2a1371e58d768a836426e9 100644
--- a/lib/PublicInbox/DS.pm
+++ b/lib/PublicInbox/DS.pm
@@ -31,7 +31,6 @@             );
 
 use Errno  qw(EINPROGRESS EWOULDBLOCK EISCONN ENOTSOCK
               EPIPE EAGAIN EBADF ECONNRESET ENOPROTOOPT);
-use Socket qw(IPPROTO_TCP);
 use Carp   qw(croak confess);
 
 use constant DebugLevel => 0;