diff --git a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider.cc b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider.cc
index cc9d9f3da1d81..2da4d27b848ce 100644
--- a/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider.cc
+++ b/onnxruntime/core/providers/nv_tensorrt_rtx/nv_execution_provider.cc
@@ -1093,7 +1093,7 @@ void NvExecutionProvider::IncrementRegularRunCountBeforeGraphCapture() {
 }
 
 std::vector<AllocatorPtr> NvExecutionProvider::CreatePreferredAllocators() {
-  OrtArenaCfg arena_cfg(0, static_cast<int>(ArenaExtendStrategy::kSameAsRequested),
+  OrtArenaCfg arena_cfg(0, static_cast<int>(ArenaExtendStrategy::kNextPowerOfTwo),
                         -1, -1, -1, -1);
   AllocatorCreationInfo default_memory_info(
       [](OrtDevice::DeviceId device_id) { return std::make_unique<CUDAAllocator>(device_id, CUDA); },
@@ -2650,7 +2650,7 @@ Status NvExecutionProvider::CreateNodeComputeInfoFromGraph(const GraphViewer& gr
       }
       if (trt_state->context_memory_size != mem_size) {
         LOGS_DEFAULT(INFO) << "[NvTensorRTRTX EP] A new context memory was allocated with size " << mem_size;
-        trt_state->context_memory = IAllocator::MakeUniquePtrFromOrtAllocator<void>(alloc, mem_size, false /*use_reserve*/);
+        trt_state->context_memory = IAllocator::MakeUniquePtrFromOrtAllocator<void>(alloc, mem_size, true /*use_reserve*/);
         trt_state->context_memory_size = mem_size;
         trt_context->setDeviceMemoryV2(trt_state->context_memory.get(), mem_size);
       }
@@ -2963,7 +2963,7 @@ Status NvExecutionProvider::CreateNodeComputeInfoFromPrecompiledEngine(const Gra
       }
       if (trt_state->context_memory_size != mem_size) {
         LOGS_DEFAULT(INFO) << "[NvTensorRTRTX EP] A new context memory was allocated with size " << mem_size;
-        trt_state->context_memory = IAllocator::MakeUniquePtrFromOrtAllocator<void>(alloc, mem_size, false /*use_reserve*/);
+        trt_state->context_memory = IAllocator::MakeUniquePtrFromOrtAllocator<void>(alloc, mem_size, true /*use_reserve*/);
         // trt_state->context_memory = IAllocator::MakeUniquePtr<void>(alloc, mem_size, false /*use_reserve*/, stream);
         trt_state->context_memory_size = mem_size;
         trt_context->setDeviceMemoryV2(trt_state->context_memory.get(), mem_size);