diff --git a/xarray/tests/test_cftimeindex.py b/xarray/tests/test_cftimeindex.py
index 20d14b053cf..09d9f69d062 100644
--- a/xarray/tests/test_cftimeindex.py
+++ b/xarray/tests/test_cftimeindex.py
@@ -134,7 +134,7 @@ def date_dict(
     list(ISO8601_LIKE_STRING_TESTS.values()),
     ids=list(ISO8601_LIKE_STRING_TESTS.keys()),
 )
-@pytest.mark.parametrize("five_digit_year", [False, True], ids=["4Y", "5Y"])
+@pytest.mark.parametrize("five_digit_year", [False, True], ids=["four-digit-year", "five-digit-year"])
 @pytest.mark.parametrize("sign", ["", "+", "-"], ids=["None", "plus", "minus"])
 def test_parse_iso8601_like(five_digit_year, sign, string, expected):
     pre = "1" if five_digit_year else ""