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-rw-r--r--Lib/argparse.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/Lib/argparse.py b/Lib/argparse.py
index 75cc28a043..8e1722a2e3 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1482,6 +1482,7 @@ class _ArgumentGroup(_ActionsContainer):
self._defaults = container._defaults
self._has_negative_number_optionals = \
container._has_negative_number_optionals
+ self._mutually_exclusive_groups = container._mutually_exclusive_groups
def _add_action(self, action):
action = super(_ArgumentGroup, self)._add_action(action)