diff --git a/tests/test_datatypes.py b/tests/test_datatypes.py
index 526074f..f390231 100644
--- a/tests/test_datatypes.py
+++ b/tests/test_datatypes.py
@@ -25,8 +25,8 @@ def test_config_yaml(tmp_path: Path):
     # change a couple of properties
     c1.step = 800
     c1.stack_method = StackMethod.ROBUST
-    c1.save_yaml(file)
     c1.substack_windows = 10
+    c1.save_yaml(file)
     c2 = ConfigParameters.load_yaml(file)
     assert c1 == c2