diff --git a/swh/dataset/luigi.py b/swh/dataset/luigi.py
--- a/swh/dataset/luigi.py
+++ b/swh/dataset/luigi.py
@@ -661,7 +661,9 @@
                 --s3-athena-output-location=s3://softwareheritage/graph/tmp/athena
     """
 
-    formats = luigi.EnumListParameter(enum=Format, batch_method=merge_lists)
+    formats = luigi.EnumListParameter(
+        enum=Format, batch_method=merge_lists, default=list(Format)
+    )
     object_types = luigi.EnumListParameter(
         enum=ObjectType, default=list(ObjectType), batch_method=merge_lists
     )