diff --git a/swh/model/hashutil.py b/swh/model/hashutil.py
--- a/swh/model/hashutil.py
+++ b/swh/model/hashutil.py
@@ -198,7 +198,7 @@
         ValueError if the git_type is unexpected.
     """
 
-    git_object_types = {'blob', 'tree', 'commit', 'tag'}
+    git_object_types = {'blob', 'tree', 'commit', 'tag', 'snapshot'}
 
     if git_type not in git_object_types:
         raise ValueError('Unexpected git object type %s, expected one of %s' %