diff --git a/UnitTests/UnitTests.vcxproj b/UnitTests/UnitTests.vcxproj
index 55a7a5d5d..3bd737b38 100644
--- a/UnitTests/UnitTests.vcxproj
+++ b/UnitTests/UnitTests.vcxproj
@@ -80,6 +80,7 @@
       <EnablePREfast>true</EnablePREfast>
       <SDLCheck>true</SDLCheck>
       <AdditionalIncludeDirectories>..\include;$(VCInstallDir)UnitTest\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32_LEAN_AND_MEAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <UseFullPaths>true</UseFullPaths>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
       <LanguageStandard>stdcpp17</LanguageStandard>
diff --git a/UnitTests/pch.h b/UnitTests/pch.h
index 472527b48..668abe607 100644
--- a/UnitTests/pch.h
+++ b/UnitTests/pch.h
@@ -5,9 +5,6 @@
 
 #pragma once
 
-#define SECURITY_WIN32
-#define _WINSOCKAPI_	// Prevent inclusion of winsock.h in windows.h
-
 #include <stdex/base64.hpp>
 #include <stdex/errno.hpp>
 #include <stdex/exception.hpp>
diff --git a/include/stdex/parser.hpp b/include/stdex/parser.hpp
index ce69bee8e..8bced4fdc 100644
--- a/include/stdex/parser.hpp
+++ b/include/stdex/parser.hpp
@@ -15,8 +15,10 @@
 #include <stdarg.h>
 #include <stdint.h>
 #ifdef _WIN32
+#ifndef _WINSOCKAPI_
 #include <winsock2.h>
 #include <ws2ipdef.h>
+#endif
 #else
 #include <inaddr.h>
 #include <in6addr.h>
diff --git a/include/stdex/stream.hpp b/include/stdex/stream.hpp
index 305cb80e2..08fafc883 100644
--- a/include/stdex/stream.hpp
+++ b/include/stdex/stream.hpp
@@ -16,7 +16,7 @@
 #include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>
-#if defined(_WIN32) && !defined(WIN32_LEAN_AND_MEAN)
+#if defined(_WIN32)
 #include <asptlb.h>
 #include <objidl.h>
 #endif
@@ -2278,7 +2278,6 @@ namespace stdex
 			ISequentialStream* m_source;
 		};
 
-#ifndef WIN32_LEAN_AND_MEAN
 		///
 		/// Wrapper for IIS ASP IRequest and IResponse
 		///
@@ -2395,7 +2394,6 @@ namespace stdex
 			IRequest* m_request;
 			IResponse* m_response;
 		};
-#endif
 #endif
 
 		///