diff --git a/app/Ninja/Transformers/InvoiceTransformer.php b/app/Ninja/Transformers/InvoiceTransformer.php
index 8108115b2f..f13b081260 100644
--- a/app/Ninja/Transformers/InvoiceTransformer.php
+++ b/app/Ninja/Transformers/InvoiceTransformer.php
@@ -25,12 +25,22 @@ class InvoiceTransformer extends EntityTransformer
         'payments'
     ];
 
+    protected $availableIncludes = [
+        'invitations',
+    ];
+
     public function includeInvoiceItems(Invoice $invoice)
     {
         $transformer = new InvoiceItemTransformer($this->account, $this->serializer);
         return $this->includeCollection($invoice->invoice_items, $transformer, ENTITY_INVOICE_ITEMS);
     }
 
+    public function includeInvitations(Invoice $invoice)
+    {
+        $transformer = new InvoiceItemTransformer($this->account, $this->serializer);
+        return $this->includeCollection($invoice->invitations, $transformer, ENTITY_INVITATION);
+    }
+
     public function includePayments(Invoice $invoice)
     {
         $transformer = new PaymentTransformer($this->account, $this->serializer);