diff --git a/swh/model/model.py b/swh/model/model.py
--- a/swh/model/model.py
+++ b/swh/model/model.py
@@ -40,6 +40,7 @@
 
 # TODO: Limit this to 20 bytes
 Sha1Git = bytes
+Sha1 = bytes
 
 
 KT = TypeVar("KT")