diff --git a/swh/loader/package/loader.py b/swh/loader/package/loader.py
--- a/swh/loader/package/loader.py
+++ b/swh/loader/package/loader.py
@@ -565,7 +565,7 @@
             discovery_date=self.visit_date,
             authority=SWH_METADATA_AUTHORITY,
             fetcher=self.get_metadata_fetcher(),
-            format="original-artifact-json",
+            format="original-artifacts-json",
             metadata=json.dumps(metadata).encode(),
             origin=self.url,
         )