diff --git a/zuul_registry/main.py b/zuul_registry/main.py
index 7835592..ccb324d 100644
--- a/zuul_registry/main.py
+++ b/zuul_registry/main.py
@@ -271,7 +271,8 @@ class RegistryAPI:
             orig_repository, uuid)
         res.headers['Docker-Upload-UUID'] = uuid
         res.headers['Content-Length'] = '0'
-        res.headers['Range'] = '0-%s' % (new_length,)
+        # Be careful to not be off-by-one, range starts at 0
+        res.headers['Range'] = '0-%s' % (new_length - 1,)
         res.status = '202 Accepted'
         self.log.info(
             '[u: %s] Finish Upload chunk %s %s', uuid, repository, new_length)