diff --git a/tests/test_interpolation.py b/tests/test_interpolation.py
index d13d1c85f..cc5c96a93 100644
--- a/tests/test_interpolation.py
+++ b/tests/test_interpolation.py
@@ -752,7 +752,7 @@ def fail_if_called(x: Any) -> None:
 
 
 @pytest.mark.parametrize(
-    ["cfg", "key", "expected_value", "expected_node_type"],
+    ("cfg", "key", "expected_value", "expected_node_type"),
     [
         pytest.param(
             User(name="Bond", age=SI("${cast:int,'7'}")),
@@ -806,7 +806,7 @@ def drop_last(s: str) -> str:
 
 
 @pytest.mark.parametrize(
-    ["cfg", "key", "expected_error"],
+    ("cfg", "key", "expected_error"),
     [
         pytest.param(
             User(name="Bond", age=SI("${cast:str,seven}")),