diff --git a/django/forms/fields.py b/django/forms/fields.py
index ac615bbe68..00e9ff102b 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -488,7 +488,7 @@ class DurationField(Field):
             return None
         if isinstance(value, datetime.timedelta):
             return value
-        value = parse_duration(value)
+        value = parse_duration(force_str(value))
         if value is None:
             raise ValidationError(self.error_messages['invalid'], code='invalid')
         return value
diff --git a/tests/forms_tests/tests/test_fields.py b/tests/forms_tests/tests/test_fields.py
index 80e17881ef..1bab912cfc 100644
--- a/tests/forms_tests/tests/test_fields.py
+++ b/tests/forms_tests/tests/test_fields.py
@@ -722,6 +722,10 @@ class FieldsTests(SimpleTestCase):
             str(f['duration'])
         )
 
+    def test_durationfield_integer_value(self):
+        f = DurationField()
+        self.assertEqual(datetime.timedelta(0, 10800), f.clean(10800))
+
     def test_durationfield_prepare_value(self):
         field = DurationField()
         td = datetime.timedelta(minutes=15, seconds=30)