diff --git a/TitanEngine/TitanEngine.vcxproj b/TitanEngine/TitanEngine.vcxproj
index 63d5429..8b11d02 100644
--- a/TitanEngine/TitanEngine.vcxproj
+++ b/TitanEngine/TitanEngine.vcxproj
@@ -127,7 +127,7 @@
     </Midl>
     <ClCompile>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;UNPACKERENGINE_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN64;_DEBUG;_WINDOWS;_USRDLL;UNPACKERENGINE_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MinimalRebuild>true</MinimalRebuild>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
@@ -187,7 +187,7 @@
     <ClCompile>
       <Optimization>MaxSpeed</Optimization>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>WIN32;NDEBUG;_WINDOWS;_USRDLL;UNPACKERENGINE_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>WIN64;NDEBUG;_WINDOWS;_USRDLL;UNPACKERENGINE_EXPORTS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <StructMemberAlignment>Default</StructMemberAlignment>
       <FunctionLevelLinking>true</FunctionLevelLinking>