diff --git a/InvenTree/order/templates/order/purchase_order_detail.html b/InvenTree/order/templates/order/purchase_order_detail.html
index 97a4ffb78e..480f2f500d 100644
--- a/InvenTree/order/templates/order/purchase_order_detail.html
+++ b/InvenTree/order/templates/order/purchase_order_detail.html
@@ -324,9 +324,9 @@ $("#po-table").inventreeTable({
             title: '{% trans "MPN" %}',
             formatter: function(value, row, index, field) {
                 if (row.supplier_part_detail && row.supplier_part_detail.manufacturer_part) {
-                    return renderLink(value, `/manufacturer-part/${row.supplier_part_detail.manufacturer_part.pk}/`);
+                    return renderLink(value, `/manufacturer-part/${row.supplier_part_detail.manufacturer_part}/`);
                 } else {
-                    return "";
+                    return "-";
                 }
             },
         },
diff --git a/InvenTree/templates/js/company.js b/InvenTree/templates/js/company.js
index 18d7408b23..7daa99e1c6 100644
--- a/InvenTree/templates/js/company.js
+++ b/InvenTree/templates/js/company.js
@@ -539,7 +539,7 @@ function loadSupplierPartTable(table, url, options) {
                 title: '{% trans "MPN" %}',
                 formatter: function(value, row, index, field) {
                     if (value && row.manufacturer_part) {
-                        return renderLink(value, `/manufacturer-part/${row.manufacturer_part.pk}/`);
+                        return renderLink(value, `/manufacturer-part/${row.manufacturer_part}/`);
                     } else {
                         return "-";
                     }