diff --git a/src/_Samples/UploadAttachment.php b/src/_Samples/UploadAttachment.php
index 1b379db7..280703a4 100644
--- a/src/_Samples/UploadAttachment.php
+++ b/src/_Samples/UploadAttachment.php
@@ -128,7 +128,7 @@
 $objAttachable->Tag = 'Tag_' . $randId;
 
 // Upload the attachment to the Bill
-$resultObj = $dataService->Upload(base64_decode($imageBase64[$sendMimeType]),
+$resultObj = $dataService->Upload($imageBase64[$sendMimeType],
                                   $objAttachable->FileName,
                                   $sendMimeType,
                                   $objAttachable);