diff --git a/xarray/tests/test_namedarray.py b/xarray/tests/test_namedarray.py
index d60c269c7f1..9bd6b342170 100644
--- a/xarray/tests/test_namedarray.py
+++ b/xarray/tests/test_namedarray.py
@@ -594,7 +594,8 @@ def test_warn_on_repeated_dimension_names(self) -> None:
 
 
 def test_repr() -> None:
-    x = NamedArray(("x",), np.array([1, 2, 3]))
+    x: NamedArray[Any, np.dtype[np.int64]]
+    x = NamedArray(("x",), np.array([1, 2, 3], dtype=np.int64))
 
     # Reprs should not crash:
     r = x.__repr__()