diff --git a/pandas/tests/util/test_hashing.py b/pandas/tests/util/test_hashing.py
index 0dff252732274..00dc184a0ac4d 100644
--- a/pandas/tests/util/test_hashing.py
+++ b/pandas/tests/util/test_hashing.py
@@ -243,14 +243,14 @@ def test_categorical_consistency(s1, categorize):
     tm.assert_series_equal(h1, h3)
 
 
-def test_categorical_with_nan_consistency(unit):
-    dti = pd.date_range("2012-01-01", periods=5, name="B", unit=unit)
-    cat = pd.Categorical.from_codes([-1, 0, 1, 2, 3, 4], categories=dti)
-    expected = hash_array(cat, categorize=False)
-
-    ts = pd.Timestamp("2012-01-01").as_unit(unit)
-    cat2 = pd.Categorical.from_codes([-1, 0], categories=[ts])
-    result = hash_array(cat2, categorize=False)
+def test_categorical_with_nan_consistency():
+    c = pd.Categorical.from_codes(
+        [-1, 0, 1, 2, 3, 4], categories=pd.date_range("2012-01-01", periods=5, name="B")
+    )
+    expected = hash_array(c, categorize=False)
+
+    c = pd.Categorical.from_codes([-1, 0], categories=[pd.Timestamp("2012-01-01")])
+    result = hash_array(c, categorize=False)
 
     assert result[0] in expected
     assert result[1] in expected