diff --git a/winml/lib/Common/CommonDeviceHelpers.cpp b/winml/lib/Common/CommonDeviceHelpers.cpp
index dd5cc5962d5ea..e23a7f475b31d 100644
--- a/winml/lib/Common/CommonDeviceHelpers.cpp
+++ b/winml/lib/Common/CommonDeviceHelpers.cpp
@@ -154,7 +154,7 @@ bool IsFloat16Supported(const winrt::Windows::AI::MachineLearning::LearningModel
 
 bool IsFloat16Supported(ID3D12Device* device) {
 #ifndef USE_DML
-    throw winrt::hresult_error(ERROR_NOT_SUPPORTED, L"IsFloat16Supported is not implemented for WinML only build."); 
+    throw winrt::hresult_error(E_NOTIMPL, L"IsFloat16Supported is not implemented for WinML only build."); 
 #else
   bool isBlocked;
   if (FAILED(IsFloat16Blocked(*device, &isBlocked)) || isBlocked) {