diff --git a/python/ray/experimental/multiprocessing/pool.py b/python/ray/experimental/multiprocessing/pool.py
index ed2e52eaa..7ef361ec4 100644
--- a/python/ray/experimental/multiprocessing/pool.py
+++ b/python/ray/experimental/multiprocessing/pool.py
@@ -270,7 +270,7 @@ class UnorderedIMapIterator(IMapIterator):
         return self._ready_objects.popleft()
 
 
-@ray.remote
+@ray.remote(num_cpus=1)
 class PoolActor:
     """Actor used to process tasks submitted to a Pool."""