diff --git a/app/Ninja/Transformers/DocumentTransformer.php b/app/Ninja/Transformers/DocumentTransformer.php
index 4cbfa06191..4130bbd6c4 100644
--- a/app/Ninja/Transformers/DocumentTransformer.php
+++ b/app/Ninja/Transformers/DocumentTransformer.php
@@ -14,6 +14,7 @@ class DocumentTransformer extends EntityTransformer
             'type' =>  $document->type,
             'invoice_id' => isset($document->invoice->public_id) ? (int) $document->invoice->public_id : null,
             'expense_id' => isset($document->expense->public_id) ? (int) $document->expense->public_id : null,
+            'updated_at' => $this->getTimestamp($document->updated_at),
         ]);
     }
-}
\ No newline at end of file
+}