diff --git a/scripts/libtrim.pl b/scripts/libtrim.pl
index 9cd56cd..0bec6ae 100755
--- a/scripts/libtrim.pl
+++ b/scripts/libtrim.pl
@@ -10,6 +10,9 @@
 open (LIB, $ARGV[1]) ;
 my $prefix = $ARGV[0];
 my @cells = (
+              # conb - 1
+              'conb_1',
+
               # AND - 9
               'and2_1','and2_2','and2_4',
               'and3_1','and3_2','and3_4',