diff --git a/arraycontext/pytest.py b/arraycontext/pytest.py
index b1bbec952770b89635a76ac92effbc1dda56275f..66fe5a0580a5fea01a9d326905cdb1f64aca6a4b 100644
--- a/arraycontext/pytest.py
+++ b/arraycontext/pytest.py
@@ -344,7 +344,7 @@ def pytest_generate_tests_for_array_contexts(
             return
 
         arg_values, ids = cl_tools.get_pyopencl_fixture_arg_values()
-        empty_arg_dict = {k: None for k in arg_values[0]}
+        empty_arg_dict = dict.fromkeys(arg_values[0])
 
         # }}}