diff --git a/Lib/argparse.py b/Lib/argparse.py
index d24fa72e573d4f..a475fee34d5418 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -933,7 +933,6 @@ def __init__(self,
                  default=None,
                  required=False,
                  help=None,
-                 metavar=None,
                  deprecated=False):
         super(_StoreConstAction, self).__init__(
             option_strings=option_strings,