diff --git a/tests/test_timefuncs.py b/tests/test_timefuncs.py
index 208e6c60..1d7a11bf 100644
--- a/tests/test_timefuncs.py
+++ b/tests/test_timefuncs.py
@@ -753,7 +753,8 @@ def test_some_offsets() -> None:
 def test_timestampseries_offset() -> None:
     """Test that adding an offset to a timestamp series works."""
     vv = pd.bdate_range("2024-09-01", "2024-09-10")
-    vv + pd.tseries.offsets.YearEnd(0)
+    shifted_vv = vv + pd.tseries.offsets.YearEnd(0)
+    check(assert_type(shifted_vv, pd.DatetimeIndex), pd.DatetimeIndex)
 
 
 def test_types_to_numpy() -> None: