lib/PublicInbox/Filter/Base.pm | 1 -

diff --git a/lib/PublicInbox/Filter/Base.pm b/lib/PublicInbox/Filter/Base.pm
index 052cd3328aa66a470a9ddb19845edca3a1dcc4ce..7a0c720f679d793cdbc541eae5118e7c012f9152 100644
--- a/lib/PublicInbox/Filter/Base.pm
+++ b/lib/PublicInbox/Filter/Base.pm
@@ -6,7 +6,6 @@ package PublicInbox::Filter::Base;
 use strict;
 use warnings;
 use PublicInbox::MsgIter;
-use constant MAX_MID_SIZE => 244; # max term size - 1 in Xapian
 
 sub No ($) { "*** We only accept plain-text mail, No $_[0] ***" }