diff --git a/catalogue/detail.pl b/catalogue/detail.pl
index ebc138de93..c438222089 100755
--- a/catalogue/detail.pl
+++ b/catalogue/detail.pl
@@ -427,7 +427,7 @@ if (C4::Context->preference("virtualshelves") ) {
 if (C4::Context->preference("FRBRizeEditions")==1) {
     eval {
         $template->param(
-            XISBNS => get_xisbns($isbn)
+            XISBNS => scalar get_xisbns($isbn)
         );
     };
     if ($@) { warn "XISBN Failed $@"; }
diff --git a/opac/opac-detail.pl b/opac/opac-detail.pl
index f13ca25933..de946de40a 100755
--- a/opac/opac-detail.pl
+++ b/opac/opac-detail.pl
@@ -857,7 +857,7 @@ if (C4::Context->preference("virtualshelves") ) {
 if (C4::Context->preference("OPACFRBRizeEditions")==1) {
     eval {
         $template->param(
-            XISBNS => get_xisbns($isbn)
+            XISBNS => scalar get_xisbns($isbn)
         );
     };
     if ($@) { warn "XISBN Failed $@"; }