diff --git a/craftos2-lua.vcxproj b/craftos2-lua.vcxproj
index 32350bf..f03b483 100644
--- a/craftos2-lua.vcxproj
+++ b/craftos2-lua.vcxproj
@@ -147,6 +147,7 @@
       <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_LIB;LUA_BUILD_AS_DLL</PreprocessorDefinitions>
     </ClCompile>
     <Lib>
       <OutputFile>$(OutDir)$(TargetName)$(TargetExt)</OutputFile>
@@ -172,6 +173,7 @@
     <ClCompile>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;LUA_BUILD_AS_DLL</PreprocessorDefinitions>
     </ClCompile>
     <PostBuildEvent>
       <Command>copy src\lua51.dll ..\x64\ReleaseC\lua51.dll</Command>