diff --git a/grid2op/gym_compat/box_gym_obsspace.py b/grid2op/gym_compat/box_gym_obsspace.py
index edb979383..d0aecf761 100644
--- a/grid2op/gym_compat/box_gym_obsspace.py
+++ b/grid2op/gym_compat/box_gym_obsspace.py
@@ -618,10 +618,10 @@ def __init__(
 
         if subtract is None:
             subtract = {}
-        self._subtract = subtract
+        self._subtract = subtract.copy()
         if divide is None:
             divide = {}
-        self._divide = divide
+        self._divide = divide.copy()
 
         # handle the "functional" part
         self._template_obs = ob_sp._template_obj.copy()
diff --git a/grid2op/tests/test_issue_446.py b/grid2op/tests/test_issue_446.py
new file mode 100644
index 000000000..d9aad58f7
--- /dev/null
+++ b/grid2op/tests/test_issue_446.py
@@ -0,0 +1,45 @@
+# Copyright (c) 2023, RTE (https://www.rte-france.com)
+# See AUTHORS.txt
+# This Source Code Form is subject to the terms of the Mozilla Public License, version 2.0.
+# If a copy of the Mozilla Public License, version 2.0 was not distributed with this file,
+# you can obtain one at http://mozilla.org/MPL/2.0/.
+# SPDX-License-Identifier: MPL-2.0
+# This file is part of Grid2Op, Grid2Op a testbed platform to model sequential decision making in power systems.
+
+
+import grid2op
+from grid2op.gym_compat import BoxGymActSpace, BoxGymObsSpace
+import numpy as np
+import unittest
+
+
+class Issue446Tester(unittest.TestCase):
+    def test_box_action_space(self):
+        # We considers only redispatching actions
+        env = grid2op.make("l2rpn_case14_sandbox", test=True)
+
+        divide = {"hour_of_day": np.ones(1)}
+        subtract = {"hour_of_day": np.zeros(1)}
+
+        gym_observation_space_1 =  BoxGymObsSpace(env.observation_space,
+                                                attr_to_keep=["curtailment_mw", "hour_of_day"],
+                                                divide = divide,
+                                                subtract = subtract
+                                                )
+
+        gym_observation_space_2 =  BoxGymObsSpace(env.observation_space.copy(),
+                                                attr_to_keep=["curtailment_mw", "hour_of_day"],
+                                                divide = divide,
+                                                subtract = subtract
+                                                )
+        
+        gym_observation_space_1.normalize_attr("curtailment_mw")
+            
+        assert "curtailment_mw" in gym_observation_space_1._divide
+        assert "curtailment_mw" not in gym_observation_space_2._divide
+        assert "curtailment_mw" in gym_observation_space_1._subtract
+        assert "curtailment_mw" not in gym_observation_space_2._subtract
+        
+        
+if __name__ == "__main__":
+    unittest.main()
\ No newline at end of file