diff --git a/nibabel/tests/test_tripwire.py b/nibabel/tests/test_tripwire.py
index d7daefe0b..4bf91923f 100644
--- a/nibabel/tests/test_tripwire.py
+++ b/nibabel/tests/test_tripwire.py
@@ -16,5 +16,5 @@ def test_tripwire():
     with pytest.raises(TripWireError):
         silly_module_name.do_silly_thing
     # Check AttributeError can be checked too
-    with pytest.raises(AttributeError) as err:
+    with pytest.raises(AttributeError):
         silly_module_name.__wrapped__