diff --git a/diff_gaussian_rasterization/__init__.py b/diff_gaussian_rasterization/__init__.py
index 7d5b510..de27150 100644
--- a/diff_gaussian_rasterization/__init__.py
+++ b/diff_gaussian_rasterization/__init__.py
@@ -11,7 +11,7 @@
 
 import json
 import dacite
-from dataclasses import dataclass, asdict
+from dataclasses import dataclass, asdict, field
 from typing import NamedTuple
 import torch.nn as nn
 import torch
@@ -202,7 +202,7 @@ def set_value(self, key, value):
 
 @dataclass
 class SortSettings:
-    queue_sizes : SortQueueSizes = SortQueueSizes()
+    queue_sizes : SortQueueSizes = field(default_factory=SortQueueSizes)
     sort_mode : SortMode = SortMode.GLOBAL
     sort_order : GlobalSortOrder = GlobalSortOrder.Z_DEPTH
     
@@ -225,8 +225,8 @@ def set_value(self, key, value):
         
 @dataclass
 class ExtendedSettings:
-    sort_settings : SortSettings = SortSettings()
-    culling_settings : CullingSettings = CullingSettings()
+    sort_settings : SortSettings = field(default_factory=SortSettings)
+    culling_settings : CullingSettings = field(default_factory=CullingSettings)
     load_balancing : bool = False
     proper_ewa_scaling : bool = False
     def to_dict(self):