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-rw-r--r--django/forms/fields.py1
-rw-r--r--tests/forms_tests/tests/test_fields.py1
2 files changed, 2 insertions, 0 deletions
diff --git a/django/forms/fields.py b/django/forms/fields.py
index 09e20617ad..6d1c14586e 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -516,6 +516,7 @@ class DurationField(Field):
def prepare_value(self, value):
if isinstance(value, datetime.timedelta):
return duration_string(value)
+ return value
def to_python(self, value):
if value in self.empty_values:
diff --git a/tests/forms_tests/tests/test_fields.py b/tests/forms_tests/tests/test_fields.py
index 5f44811b93..477beee210 100644
--- a/tests/forms_tests/tests/test_fields.py
+++ b/tests/forms_tests/tests/test_fields.py
@@ -647,6 +647,7 @@ class FieldsTests(SimpleTestCase):
field = DurationField()
td = datetime.timedelta(minutes=15, seconds=30)
self.assertEqual(field.prepare_value(td), duration_string(td))
+ self.assertEqual(field.prepare_value('arbitrary'), 'arbitrary')
self.assertIsNone(field.prepare_value(None))
# RegexField ##################################################################