diff --git a/runtime/onert/backend/train/ExtraTensorGenerator.cc b/runtime/onert/backend/train/ExtraTensorGenerator.cc
index 0cbe8b8b1f9..6e2cf2aa978 100644
--- a/runtime/onert/backend/train/ExtraTensorGenerator.cc
+++ b/runtime/onert/backend/train/ExtraTensorGenerator.cc
@@ -51,7 +51,7 @@ void ExtraTensorGenerator::register_tensors(ir::OperationIndex op_idx, ExtraTens
   {
     // register tensor
     ExtraTensorIndex tensor_idx(op_idx, i);
-    _tensor_builder->registerExtraTensorInfo(tensor_idx, reqs[i].info);
+    _tensor_builder->registerExtraTensorInfo(tensor_idx, reqs[i].info());
 
     std::stringstream op_info;
     op_info << op_idx << "_" << operations.at(op_idx).name();
@@ -60,7 +60,7 @@ void ExtraTensorGenerator::register_tensors(ir::OperationIndex op_idx, ExtraTens
 
     // return registered tensor
     auto generated_tensor = _tensor_reg->getExtraTensor(tensor_idx);
-    *reqs[i].address = generated_tensor;
+    reqs[i].update_address(generated_tensor);
   }
   return;
 }
@@ -74,7 +74,7 @@ void ExtraTensorGenerator::plan()
     auto &reqs = _idx_to_requests[op_index];
     for (auto i = 0u; i < reqs.size(); ++i)
     {
-      auto &lt = reqs[i].lifetime;
+      const auto &lt = reqs[i].lifetime();
       if (lt == ExtraTensorLifeTime::FORWARD_TO_BACKWARD)
         _tensor_builder->notifyFirstUse(ExtraTensorIndex(op_index, i));
     }
@@ -88,14 +88,14 @@ void ExtraTensorGenerator::plan()
 
     for (auto i = 0u; i < reqs.size(); ++i)
     {
-      auto &lt = reqs[i].lifetime;
+      const auto &lt = reqs[i].lifetime();
       if (lt == ExtraTensorLifeTime::BACKWARD)
         _tensor_builder->notifyFirstUse(ExtraTensorIndex(op_index, i));
     }
 
     for (auto i = 0u; i < reqs.size(); ++i)
     {
-      auto &lt = reqs[i].lifetime;
+      const auto &lt = reqs[i].lifetime();
       if (lt == ExtraTensorLifeTime::FORWARD_TO_BACKWARD || lt == ExtraTensorLifeTime::BACKWARD)
         _tensor_builder->notifyLastUse(ExtraTensorIndex(op_index, i));
     }
diff --git a/runtime/onert/core/include/backend/train/ExtraTensorRequest.h b/runtime/onert/core/include/backend/train/ExtraTensorRequest.h
index 6a430802fb8..cf6be5980cb 100644
--- a/runtime/onert/core/include/backend/train/ExtraTensorRequest.h
+++ b/runtime/onert/core/include/backend/train/ExtraTensorRequest.h
@@ -37,13 +37,13 @@ class ExtraTensorRequest
 
 public:
   ExtraTensorRequest(ir::OperandInfo info, ExtraTensorLifeTime lt,
-                     backend::train::ExtraTensor **addr)
-    : info(info), lifetime(lt), address(addr)
+                     ExtraTensor **addr)
+    : _info(info), _lifetime(lt), _address(addr)
   {
   }
 
   static ExtraTensorRequest createLike(const IPortableTensor *origin,
-                                       backend::train::ExtraTensor** addr)
+                                       ExtraTensor** addr)
   {
     assert(origin != nullptr);
     assert(addr != nullptr);
@@ -52,9 +52,25 @@ class ExtraTensorRequest
   }
 
 public:
-  const ir::OperandInfo info;
-  const ExtraTensorLifeTime lifetime;
-  backend::train::ExtraTensor ** const address;
+  const ir::OperandInfo& info() const
+  {
+    return _info;
+  }
+
+  ExtraTensorLifeTime lifetime() const
+  {
+    return _lifetime;
+  }
+
+  void update_address(ExtraTensor* tensor)
+  {
+    *_address = tensor;
+  }
+
+private:
+  ir::OperandInfo _info;
+  ExtraTensorLifeTime _lifetime;
+  backend::train::ExtraTensor ** const _address;
 };
 
 using ExtraTensorRequests = std::vector<ExtraTensorRequest>;