diff --git a/Lib/argparse.py b/Lib/argparse.py
index 5148d64..836fa5c 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1143,6 +1143,8 @@
         for name in kwargs:
             setattr(self, name, kwargs[name])
 
+    __hash__ = None
+
     def __eq__(self, other):
         return vars(self) == vars(other)