diff --git a/deepmd/dpmodel/atomic_model/base_atomic_model.py b/deepmd/dpmodel/atomic_model/base_atomic_model.py
index 6559c99d8a..b8c4902d68 100644
--- a/deepmd/dpmodel/atomic_model/base_atomic_model.py
+++ b/deepmd/dpmodel/atomic_model/base_atomic_model.py
@@ -61,7 +61,8 @@ def atomic_output_def(self) -> FittingOutputDef:
         else:
             old_list = list(old_def.get_data().values())
             return FittingOutputDef(
-                old_list.append(
+                old_list  # noqa:RUF005
+                + [
                     OutputVariableDef(
                         name="mask",
                         shape=[1],
@@ -69,7 +70,7 @@ def atomic_output_def(self) -> FittingOutputDef:
                         r_differentiable=False,
                         c_differentiable=False,
                     )
-                )
+                ]
             )
 
     def forward_common_atomic(
diff --git a/deepmd/pt/model/atomic_model/base_atomic_model.py b/deepmd/pt/model/atomic_model/base_atomic_model.py
index 1e1c6ec6dc..8827e3f18b 100644
--- a/deepmd/pt/model/atomic_model/base_atomic_model.py
+++ b/deepmd/pt/model/atomic_model/base_atomic_model.py
@@ -71,7 +71,8 @@ def atomic_output_def(self) -> FittingOutputDef:
         else:
             old_list = list(old_def.get_data().values())
             return FittingOutputDef(
-                old_list.append(
+                old_list  # noqa:RUF005
+                + [
                     OutputVariableDef(
                         name="mask",
                         shape=[1],
@@ -79,7 +80,7 @@ def atomic_output_def(self) -> FittingOutputDef:
                         r_differentiable=False,
                         c_differentiable=False,
                     )
-                )
+                ]
             )
 
     def forward_common_atomic(