diff --git a/tensorflow_federated/python/core/impl/executors/federated_composing_strategy.py b/tensorflow_federated/python/core/impl/executors/federated_composing_strategy.py
index 7d99abecc7..7d6bdb5d11 100644
--- a/tensorflow_federated/python/core/impl/executors/federated_composing_strategy.py
+++ b/tensorflow_federated/python/core/impl/executors/federated_composing_strategy.py
@@ -172,7 +172,6 @@ def __init__(self, executor: federating_executor.FederatingExecutor,
       py_typecheck.check_type(e, executor_base.Executor)
     self._server_executor = server_executor
     self._target_executors = target_executors
-    self._cardinalities_task = None
 
   def close(self):
     self._server_executor.close()