diff --git a/Lib/argparse.py b/Lib/argparse.py
index 9c710cef5b6aaa..08918d89afca1b 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -727,6 +727,8 @@ def _get_action_name(argument):
         return argument.metavar
     elif argument.dest not in (None, SUPPRESS):
         return argument.dest
+    elif argument.choices not in (None, SUPPRESS):
+        return "{" + ','.join(argument.choices.keys()) + "}"
     else:
         return None
 
diff --git a/Misc/NEWS.d/next/Library/2020-02-20-01-53-01.bpo-29298.laIn2S.rst b/Misc/NEWS.d/next/Library/2020-02-20-01-53-01.bpo-29298.laIn2S.rst
new file mode 100644
index 00000000000000..270b545404140b
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-02-20-01-53-01.bpo-29298.laIn2S.rst
@@ -0,0 +1,2 @@
+Fix crash in :mod:`argparse` when using subparsers and its required attribute
+is set to True.