diff --git a/opac/opac-detail.pl b/opac/opac-detail.pl
index 0685e13a59..93edc15e8a 100755
--- a/opac/opac-detail.pl
+++ b/opac/opac-detail.pl
@@ -198,6 +198,7 @@ for my $itm (@items) {
 my $dbh              = C4::Context->dbh;
 my $marcflavour      = C4::Context->preference("marcflavour");
 my $marcnotesarray   = GetMarcNotes   ($record,$marcflavour);
+my $marcisbnsarray   = GetMarcISBN    ($record,$marcflavour);
 my $marcauthorsarray = GetMarcAuthors ($record,$marcflavour);
 my $marcsubjctsarray = GetMarcSubjects($record,$marcflavour);
 my $marcseriesarray  = GetMarcSeries  ($record,$marcflavour);