diff --git a/src/BluescaleMailTemplate.php b/src/BluescaleMailTemplate.php
index 07b3258..506b93f 100644
--- a/src/BluescaleMailTemplate.php
+++ b/src/BluescaleMailTemplate.php
@@ -158,7 +158,7 @@ class BluescaleMailTemplate implements \JsonSerializable
         $file = is_object($file) && method_exists($file, 'getRealPath') ? $file->getRealPath() : $file;
 
         $this->attachments[] = [
-            'file' => $file,
+            'path' => $file,
             'filename' => $filename ?? basename($file)
         ];
     }