diff --git a/nibabel/tests/test_testing.py b/nibabel/tests/test_testing.py
index c9f91eb84..04ba813d8 100644
--- a/nibabel/tests/test_testing.py
+++ b/nibabel/tests/test_testing.py
@@ -113,7 +113,7 @@ def test_warn_error():
     with error_warnings():
         with pytest.raises(UserWarning):
             warnings.warn('A test')
-    with error_warnings() as _:
+    with error_warnings():
         with pytest.raises(UserWarning):
             warnings.warn('A test')
     assert n_warns == len(warnings.filters)