diff --git a/internal/package_ota.py b/internal/package_ota.py
index f6ad7f1..8592ca4 100755
--- a/internal/package_ota.py
+++ b/internal/package_ota.py
@@ -66,6 +66,7 @@ def process_file(fn, name, sparse=False, full_check=True, has_ab=True, alt=None)
     ret["alt"] = {
       "hash": alt_hash,
       "url": "{remote_url}/" + alt_xz_fn.name,
+      "size": alt_size,
     }
 
   return ret