diff --git a/swh/storage/backfill.py b/swh/storage/backfill.py
--- a/swh/storage/backfill.py
+++ b/swh/storage/backfill.py
@@ -110,6 +110,7 @@
         "message",
         "synthetic",
         "metadata",
+        "extra_headers",
         (
             "array(select parent_id::bytea from revision_history rh "
             "where rh.id = revision.id order by rh.parent_rank asc)",