diff --git a/hivemind/utils/mpfuture.py b/hivemind/utils/mpfuture.py
index 340f28d77..11952811a 100644
--- a/hivemind/utils/mpfuture.py
+++ b/hivemind/utils/mpfuture.py
@@ -162,7 +162,7 @@ def _maybe_initialize_mpfuture_backend(cls):
                         target=cls._process_updates_in_background,
                         args=[receiver_pipe],
                         name=f"{__name__}.BACKEND",
-                        daemon=True
+                        daemon=True,
                     )
                     cls._pipe_waiter_thread.start()