diff --git a/pandas/tests/arithmetic/test_datetime64.py b/pandas/tests/arithmetic/test_datetime64.py
index b3f4d5f5d9ee5..f7c12cbe881ea 100644
--- a/pandas/tests/arithmetic/test_datetime64.py
+++ b/pandas/tests/arithmetic/test_datetime64.py
@@ -2376,12 +2376,10 @@ def test_dti_add_series(self, tz_naive_fixture, names):
         tm.assert_index_equal(result4, expected)
 
     @pytest.mark.parametrize("op", [operator.add, roperator.radd, operator.sub])
-    def test_dti_addsub_offset_arraylike(
-        self, tz_naive_fixture, names, op, index_or_series
-    ):
-        # GH#18849, GH#19744
+    def test_dti_addsub_offset_arraylike(self, tz_naive_fixture, names, op, box):
+        # GH#18849, GH#19744, GH#19211
         box = pd.Index
-        other_box = index_or_series
+        other_box = box
 
         tz = tz_naive_fixture
         dti = pd.date_range("2017-01-01", periods=2, tz=tz, name=names[0])