diff --git a/eng/native/ijw/IJW.cmake b/eng/native/ijw/IJW.cmake
index 71d40fc282385..4d145a68470a8 100644
--- a/eng/native/ijw/IJW.cmake
+++ b/eng/native/ijw/IJW.cmake
@@ -45,7 +45,7 @@ if (CLR_CMAKE_HOST_WIN32)
 
   # 4365 - signed/unsigned mismatch
   # 4679 - Could not import member. This is an issue with IJW and static abstract methods in interfaces.
-  add_compile_options(/wd4365 /wd4679 /wd5271)
+  add_compile_options(/wd4365 /wd4679)
 
   # IJW
   add_compile_options(/clr:netcore)
@@ -93,6 +93,12 @@ if (CLR_CMAKE_HOST_WIN32)
 
   add_compile_options(/AI${CLR_SDK_REF_PACK})
 
+  file(GLOB CLR_SDK_REF_PACK_LIBS "${CLR_SDK_REF_PACK}/*.dll")
+
+  foreach(lib ${CLR_SDK_REF_PACK_LIBS})
+    add_compile_options(/FU${lib})
+  endforeach()
+
   list(APPEND LINK_LIBRARIES_ADDITIONAL ijwhost)
 
 endif()
diff --git a/src/native/corehost/test/ijw/ijw.cpp b/src/native/corehost/test/ijw/ijw.cpp
index 536b885a98673..ad54e94701f27 100644
--- a/src/native/corehost/test/ijw/ijw.cpp
+++ b/src/native/corehost/test/ijw/ijw.cpp
@@ -3,9 +3,6 @@
 
 #include <iostream>
 
-#using <System.Console.dll>
-#using <System.Runtime.Loader.dll>
-
 using namespace System;
 using namespace System::Reflection;
 using namespace System::Runtime::Loader;
diff --git a/src/tests/Interop/IJW/NativeVarargs/IjwNativeVarargs.cpp b/src/tests/Interop/IJW/NativeVarargs/IjwNativeVarargs.cpp
index 9466432d86e60..67206aece65e0 100644
--- a/src/tests/Interop/IJW/NativeVarargs/IjwNativeVarargs.cpp
+++ b/src/tests/Interop/IJW/NativeVarargs/IjwNativeVarargs.cpp
@@ -8,8 +8,6 @@
 #include <array>
 #include <functional>
 #include <iostream>
-#using <System.Runtime.dll>
-#using <System.Collections.dll>
 using namespace System::Collections::Generic;
 
 public enum class TestCases