diff --git a/tests/test_regressions.py b/tests/test_regressions.py
index 576520b9..b3540039 100644
--- a/tests/test_regressions.py
+++ b/tests/test_regressions.py
@@ -1835,6 +1835,7 @@ class RouteNestedViewset(viewsets.ModelViewSet):
     datetime.datetime(year=2021, month=1, day=1),
     datetime.date(year=2021, month=1, day=1),
     datetime.time(),
+    datetime.timedelta(days=1),
     uuid.uuid4(),
     Decimal(),
     b'deadbeef'