diff --git a/vine/synchronization.py b/vine/synchronization.py
index 115778b..139f363 100644
--- a/vine/synchronization.py
+++ b/vine/synchronization.py
@@ -32,7 +32,7 @@ def all_done():
     Note that you cannot add new promises to a barrier after
     the barrier is fulfilled.
     """
-    __slots__ = (  # noqa
+    __slots__ = (
             'p', 'args', 'kwargs', '_value', 'size',
             'ready', 'reason', 'cancelled', 'finalized',
             '__weakref__',