diff --git a/app/Models/Invoice.php b/app/Models/Invoice.php
index f2d992497..c2c720d7c 100644
--- a/app/Models/Invoice.php
+++ b/app/Models/Invoice.php
@@ -971,6 +971,8 @@ class Invoice extends EntityModel implements BalanceAffecting
             'custom_value2',
             'custom_client_label1',
             'custom_client_label2',
+            'custom_contact_label1',
+            'custom_contact_label2',
             'primary_color',
             'secondary_color',
             'hide_quantity',