diff --git a/lib/galaxy/objectstore/s3_multipart_upload.py b/lib/galaxy/objectstore/s3_multipart_upload.py
index 4f120ce60d3..64b15ce76f9 100644
--- a/lib/galaxy/objectstore/s3_multipart_upload.py
+++ b/lib/galaxy/objectstore/s3_multipart_upload.py
@@ -69,7 +69,7 @@ def multipart_upload(s3server, bucket, s3_key_name, tarball, mb_size):
 
     for (i, part) in enumerate(split_file(tarball, mb_size)):
         t = threading.Thread(
-            target=transfer_part, 
+            target=transfer_part,
             args=(s3server, mp.id, mp.key_name, mp.bucket_name, i, part))
         t.start()
         t.join()