diff --git a/pandas/tests/indexes/datetimes/test_datetime.py b/pandas/tests/indexes/datetimes/test_datetime.py
index 50983dbd8db22..ec4162f87010f 100644
--- a/pandas/tests/indexes/datetimes/test_datetime.py
+++ b/pandas/tests/indexes/datetimes/test_datetime.py
@@ -53,7 +53,7 @@ def test_reindex_with_same_tz(self):
         expected1 = DatetimeIndex(
             expected_list1, dtype="datetime64[ns, UTC]", freq=None,
         )
-        expected2 = np.array([0] + [-1] * 21 + [23], dtype=np.int64,)
+        expected2 = np.array([0] + [-1] * 21 + [23], dtype=np.dtype("intp"))
         tm.assert_index_equal(result1, expected1)
         tm.assert_numpy_array_equal(result2, expected2)