diff --git a/circ/article-request-slip.pl b/circ/article-request-slip.pl
index 7c8ec50823..4330214c25 100755
--- a/circ/article-request-slip.pl
+++ b/circ/article-request-slip.pl
@@ -24,6 +24,7 @@ use CGI qw( -utf8 );
 use C4::Context;
 use C4::Output;
 use C4::Auth;
+use C4::Letters;
 use Koha::ArticleRequests;
 use Koha::Patrons;