diff --git a/xarray/tests/test_namedarray.py b/xarray/tests/test_namedarray.py
index 7687765e659..c9b63d0d518 100644
--- a/xarray/tests/test_namedarray.py
+++ b/xarray/tests/test_namedarray.py
@@ -561,3 +561,6 @@ def test_broadcast_to_errors(
     def test_warn_on_repeated_dimension_names(self) -> None:
         with pytest.warns(UserWarning, match="Duplicate dimension names"):
             NamedArray(("x", "x"), np.arange(4).reshape(2, 2))
+
+    def test_pd_index_duckarray() -> None:
+        a: duckarray = pd.Index([])