diff --git a/luasec.vcxproj b/luasec.vcxproj
index 3d2905a..22aa139 100644
--- a/luasec.vcxproj
+++ b/luasec.vcxproj
@@ -49,7 +49,7 @@
     <ClCompile>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>C:\devel\openssl\include;C:\devel\lua-dll9\include;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LUASEC_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;LUASEC_EXPORTS;LUASEC_INET_NTOP;WINVER=0x0501;_WIN32_WINNT=0x0501;NTDDI_VERSION=0x05010300;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MinimalRebuild>true</MinimalRebuild>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
@@ -122,4 +122,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>