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-rw-r--r--django/forms/fields.py1
1 files changed, 1 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: