diff --git a/app/Transformers/ClientContactTransformer.php b/app/Transformers/ClientContactTransformer.php
index 8a053984be28..c850b1c9fbab 100644
--- a/app/Transformers/ClientContactTransformer.php
+++ b/app/Transformers/ClientContactTransformer.php
@@ -45,6 +45,7 @@ class ClientContactTransformer extends EntityTransformer
             'custom_value3' => $contact->custom_value3 ?: '',
             'custom_value4' => $contact->custom_value4 ?: '',
             'contact_key' => $contact->contact_key,
+            'send_invoice' => (bool) $contact->send_invoice,
         ];
     }
 }