diff --git a/cataloguing/value_builder/stocknumberAV.pl b/cataloguing/value_builder/stocknumberAV.pl
index 8eea7e1055..8860060c41 100755
--- a/cataloguing/value_builder/stocknumberAV.pl
+++ b/cataloguing/value_builder/stocknumberAV.pl
@@ -21,6 +21,7 @@ use Modern::Perl;
 use C4::Auth;
 use CGI qw ( -utf8 );
 use C4::Context;
+use C4::Output;
 
 =head1 DESCRIPTION