diff --git a/trello_full_backup/backup.py b/trello_full_backup/backup.py
index 94af81e..e843bba 100755
--- a/trello_full_backup/backup.py
+++ b/trello_full_backup/backup.py
@@ -90,7 +90,8 @@ def download_attachments(c, max_size, tokenize=False):
             try:
                 content = requests.get(attachment['url'],
                                        stream=True,
-                                       timeout=ATTACHMENT_REQUEST_TIMEOUT)
+                                       timeout=ATTACHMENT_REQUEST_TIMEOUT,
+                                       headers={"Authorization":"OAuth oauth_consumer_key=\"{}\", oauth_token=\"{}\"".format(API_KEY, API_TOKEN)})
             except Exception:
                 sys.stderr.write('Failed download: {}'.format(attachment_name))
                 continue