diff --git a/generate_parameter_library_py/generate_parameter_library_py/test/YAML_parse_error_test.py b/generate_parameter_library_py/generate_parameter_library_py/test/YAML_parse_error_test.py
index aad425c..e1f8ff9 100644
--- a/generate_parameter_library_py/generate_parameter_library_py/test/YAML_parse_error_test.py
+++ b/generate_parameter_library_py/generate_parameter_library_py/test/YAML_parse_error_test.py
@@ -81,7 +81,7 @@ def set_up(yaml_test_file):
     ],
 )
 def test_expected(test_input, expected):
-    if sys.flags.optimize:
+    if not __debug__:
         if test_input == 'wrong_default_type.yaml':
             pytest.skip(
                 'Evaluating optimized type validation cannot be completed when python is optimized'