diff --git a/src/fake_bpy_module/transformer/data_type_refiner.py b/src/fake_bpy_module/transformer/data_type_refiner.py
index 3ffe21b8..1ea505f3 100644
--- a/src/fake_bpy_module/transformer/data_type_refiner.py
+++ b/src/fake_bpy_module/transformer/data_type_refiner.py
@@ -695,7 +695,7 @@ def is_cls_attr_in_never_none_blacklist(
                         additional_info["data_name"]):
                     option_results.append("never none")
 
-            option_results = sorted(list(set(option_results)))
+            option_results = sorted(set(option_results))
             r.attributes["option"] = ",".join(option_results)
 
         output_log(