diff --git a/opac/opac-authoritiesdetail.pl b/opac/opac-authoritiesdetail.pl
index 688a9c5d19..0d3e7f01e4 100755
--- a/opac/opac-authoritiesdetail.pl
+++ b/opac/opac-authoritiesdetail.pl
@@ -67,6 +67,7 @@ my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
 );
 
 my $authid = $query->param('authid');
+$authid = int($authid);
 my $record = GetAuthority( $authid );
 if ( ! $record ) {
     print $query->redirect("/cgi-bin/koha/errors/404.pl"); # escape early