diff --git a/opac/opac-authoritiesdetail.pl b/opac/opac-authoritiesdetail.pl
index 9acacb16be..ed0a1c7014 100755
--- a/opac/opac-authoritiesdetail.pl
+++ b/opac/opac-authoritiesdetail.pl
@@ -42,7 +42,7 @@ use C4::Auth qw( get_template_and_user );
 use C4::Biblio qw( GetMarcUrls );
 use C4::Context;
 use C4::Output qw( output_html_with_http_headers );
-use C4::AuthoritiesMarc qw( GetAuthority BuildSummary GetTagsLabels );
+use C4::AuthoritiesMarc qw( GetAuthority BuildSummary GetTagsLabels GenerateHierarchy );
 use CGI qw ( -utf8 );
 use C4::Koha;