diff --git a/Lib/sets.py b/Lib/sets.py
index 1072dd29464..2d44c286665 100644
--- a/Lib/sets.py
+++ b/Lib/sets.py
@@ -273,7 +273,7 @@ def _compute_hash(self):
 class ImmutableSet(BaseSet):
     """Immutable set class."""
 
-    __slots__ = ['_hash']
+    __slots__ = ['_hashcode']
 
     # BaseSet + hashing