diff --git a/conservancy_beancount/cliutil.py b/conservancy_beancount/cliutil.py
index 7ea814766869ef346b8221b164c4d2a84b9bb78b..3e7138e3fb5eac5f4db1b574de62060e927df9af 100644
--- a/conservancy_beancount/cliutil.py
+++ b/conservancy_beancount/cliutil.py
@@ -94,7 +94,11 @@ class EnumArgument(Generic[ET]):
     def enum_type(self, arg: str) -> ET:
         """Return a single enum whose name matches the user argument"""
         regexp = re.compile(re.escape(arg), re.IGNORECASE)
-        matches = frozenset(choice for choice in self.base if regexp.match(choice.name))
+        matches = frozenset(
+            choice
+            for name, choice in self.base.__members__.items()
+            if regexp.match(name)
+        )
         count = len(matches)
         if count == 1:
             return next(iter(matches))
diff --git a/tests/test_cliutil.py b/tests/test_cliutil.py
index b4013b6777c1d5c3a8ade47e1c5dc10aed736c19..510d6152c6d8d2f9ca7723a379d580c018774a9f 100644
--- a/tests/test_cliutil.py
+++ b/tests/test_cliutil.py
@@ -32,6 +32,8 @@ class ArgChoices(enum.Enum):
     AA = 'aa'
     AB = 'ab'
     BB = 'bb'
+    START = AA
+    END = BB
 
 
 class MockTraceback:
@@ -270,9 +272,9 @@ def test_diff_year(date, diff, expected):
 def test_can_run(cmd, expected):
     assert cliutil.can_run(cmd) == expected
 
-@pytest.mark.parametrize('choice', ArgChoices)
-def test_enum_arg_enum_type(arg_enum, choice):
-    assert arg_enum.enum_type(choice.name) is choice
+@pytest.mark.parametrize('name,choice', ArgChoices.__members__.items())
+def test_enum_arg_enum_type(arg_enum, name, choice):
+    assert arg_enum.enum_type(name.lower()) is choice
     assert arg_enum.enum_type(choice.value) is choice
 
 @pytest.mark.parametrize('arg', 'az\0')
@@ -280,9 +282,9 @@ def test_enum_arg_no_enum_match(arg_enum, arg):
     with pytest.raises(ValueError):
         arg_enum.enum_type(arg)
 
-@pytest.mark.parametrize('choice', ArgChoices)
-def test_enum_arg_value_type(arg_enum, choice):
-    assert arg_enum.value_type(choice.name) == choice.value
+@pytest.mark.parametrize('name,choice', ArgChoices.__members__.items())
+def test_enum_arg_value_type(arg_enum, name, choice):
+    assert arg_enum.value_type(name.lower()) == choice.value
     assert arg_enum.value_type(choice.value) == choice.value
 
 @pytest.mark.parametrize('arg', 'az\0')