diff --git a/tests/test_data.py b/tests/test_data.py
index 5d370d02c..0906ab843 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -375,7 +375,7 @@ def test_implicit_coords_series(self, seeded_test):
         pd = pytest.importorskip("pandas")
         ser_sales = pd.Series(
             data=np.random.randint(low=0, high=30, size=22),
-            index=pd.date_range(start="2020-05-01", periods=22, freq="24H", name="date"),
+            index=pd.date_range(start="2020-05-01", periods=22, freq="24h", name="date"),
             name="sales",
         )
         with pm.Model() as pmodel: