diff --git a/week05-testing/test_times.py b/week05-testing/test_times.py
index cc3aa95..6af2fee 100644
--- a/week05-testing/test_times.py
+++ b/week05-testing/test_times.py
@@ -5,7 +5,7 @@
 with open('week05-testing/fixture.yaml') as f:
     inputs = yaml.load(f, Loader=yaml.FullLoader)
 
-@pytest.mark.parametrize("interval1, interval2, expected", [x.values() for x in inputs.values()], ids=inputs.keys())
+@pytest.mark.parametrize("interval1, interval2, expected", [x.values() for x in inputs.values()], ids=list(inputs.keys()))
 def test_input(interval1, interval2, expected):
     result = compute_overlap_time(eval(interval1), eval(interval2))
     assert result == list(map(eval, expected))