diff --git a/csharp/src/Microsoft.ML.OnnxRuntime/NativeOnnxTensorMemory.shared.cs b/csharp/src/Microsoft.ML.OnnxRuntime/NativeOnnxTensorMemory.shared.cs
index b2439c32b0..ce339b6a52 100644
--- a/csharp/src/Microsoft.ML.OnnxRuntime/NativeOnnxTensorMemory.shared.cs
+++ b/csharp/src/Microsoft.ML.OnnxRuntime/NativeOnnxTensorMemory.shared.cs
@@ -248,7 +248,7 @@ namespace Microsoft.ML.OnnxRuntime
                 {
                     throw new ArgumentOutOfRangeException(nameof(elementIndex));
                 }
-                return new MemoryHandle((void*)((int)_dataBufferPointer + elementIndex * ElementWidth)); //could not use Unsafe.Add
+                return new MemoryHandle(new IntPtr(_dataBufferPointer.ToInt64() + (long)elementIndex * ElementWidth).ToPointer());
             }
         }