diff --git a/src/scmrepo/git/backend/dulwich/__init__.py b/src/scmrepo/git/backend/dulwich/__init__.py
index 99646370..4e47e9cc 100644
--- a/src/scmrepo/git/backend/dulwich/__init__.py
+++ b/src/scmrepo/git/backend/dulwich/__init__.py
@@ -580,7 +580,7 @@ def update_refs(refs):
             result = client.send_pack(
                 path,
                 update_refs,
-                self.repo.object_store.generate_pack_data,
+                generate_pack_data=self.repo.generate_pack_data,
                 progress=(DulwichProgressReporter(progress) if progress else None),
             )
         except (NotGitRepository, SendPackError) as exc: