diff --git a/app/Utils/HtmlEngine.php b/app/Utils/HtmlEngine.php
index f8b2fd4b7c13..190d7286eff4 100644
--- a/app/Utils/HtmlEngine.php
+++ b/app/Utils/HtmlEngine.php
@@ -151,6 +151,7 @@ class HtmlEngine
         $data['$invoice.balance_due']    = ['value' => Number::formatMoney($this->entity->balance, $this->client) ?: ' ', 'label' => ctrans('texts.balance_due')];
         $data['$quote.balance_due']      = &$data['$invoice.balance_due'];
         $data['$balance_due']            = &$data['$invoice.balance_due'];
+        $data['$outstanding']            = &$data['$balance_due'];
         $data['$invoice.partial_due']    = ['value' => Number::formatMoney($this->entity->partial, $this->client) ?: ' ', 'label' => ctrans('texts.partial_due')];
         $data['$total']                  = ['value' => Number::formatMoney($this->entity_calc->getTotal(), $this->client) ?: ' ', 'label' => ctrans('texts.total')];
         $data['$amount']                 = &$data['$total'];