diff --git a/Lib/pstats.py b/Lib/pstats.py
index 0f93ae0..e77459d 100644
--- a/Lib/pstats.py
+++ b/Lib/pstats.py
@@ -26,14 +26,15 @@
 import marshal
 import re
 
-from enum import Enum
+from enum import StrEnum, _simple_enum
 from functools import cmp_to_key
 from dataclasses import dataclass
 from typing import Dict
 
 __all__ = ["Stats", "SortKey", "FunctionProfile", "StatsProfile"]
 
-class SortKey(str, Enum):
+@_simple_enum(StrEnum)
+class SortKey:
     CALLS = 'calls', 'ncalls'
     CUMULATIVE = 'cumulative', 'cumtime'
     FILENAME = 'filename', 'module'