diff --git a/tripleo_common/image/image_uploader.py b/tripleo_common/image/image_uploader.py
index 954b5b666..a1d9f98b2 100644
--- a/tripleo_common/image/image_uploader.py
+++ b/tripleo_common/image/image_uploader.py
@@ -1798,7 +1798,8 @@ class PythonImageUploader(BaseImageUploader):
         }
         source_blob_url = cls._build_url(
             source_url, CALL_BLOB % parts)
-        chunk_size = 2 ** 20
+        # NOTE(aschultz): We specify None and let requests figure it out
+        chunk_size = None
         LOG.info("[%s] Fetching layer %s from %s" %
                  (image, digest, source_blob_url))
         with session.get(source_blob_url,