diff --git a/app/Transformers/CreditTransformer.php b/app/Transformers/CreditTransformer.php
index 9a720f9fb426..ba6484e3d08e 100644
--- a/app/Transformers/CreditTransformer.php
+++ b/app/Transformers/CreditTransformer.php
@@ -131,6 +131,7 @@ class CreditTransformer extends EntityTransformer
             'exchange_rate' => (float) $credit->exchange_rate,
             'paid_to_date' => (float) $credit->paid_to_date,
             'subscription_id' => $this->encodePrimaryKey($credit->subscription_id),
+            'invoice_id' => $credit->invoice_id ? $this->encodePrimaryKey($credit->invoice_id) : '',
         ];
     }
 }