diff --git a/source/api_cc/src/DeepPotPT.cc b/source/api_cc/src/DeepPotPT.cc
index 1b1229ec85..69d73c18e2 100644
--- a/source/api_cc/src/DeepPotPT.cc
+++ b/source/api_cc/src/DeepPotPT.cc
@@ -221,10 +221,10 @@ void DeepPotPT::compute(ENERGYVTYPE& ener,
       torch::from_blob(atype_64.data(), {1, natoms}, int_options).to(device);
   inputs.push_back(atype_Tensor);
   c10::optional<torch::Tensor> box_Tensor;
-  if(!box.empty())
-  {
-    box_Tensor = torch::from_blob(const_cast<VALUETYPE*>(box.data()), {1, 9}, options)
-          .to(device);
+  if (!box.empty()) {
+    box_Tensor =
+        torch::from_blob(const_cast<VALUETYPE*>(box.data()), {1, 9}, options)
+            .to(device);
   }
   inputs.push_back(box_Tensor);
   c10::optional<torch::Tensor> fparam_tensor;