diff --git a/UI/UI.vcxproj b/UI/UI.vcxproj
index 13f913d35b..7257c95768 100644
--- a/UI/UI.vcxproj
+++ b/UI/UI.vcxproj
@@ -121,7 +121,7 @@
       <PrecompiledHeader>
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;WIN32;_DEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;_ARCH_32=1;WIN32;_DEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../common;..;../ext/native;../ext/native/ext/glew;../ext/zlib;../ext/native/ext</AdditionalIncludeDirectories>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <MinimalRebuild>false</MinimalRebuild>
@@ -143,7 +143,7 @@
       <PrecompiledHeader>
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
-      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;WIN32;_DEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;_ARCH_64=1;WIN32;_DEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../common;..;../ext/native;../ext/native/ext/glew;../ext/zlib;../ext/native/ext</AdditionalIncludeDirectories>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <MinimalRebuild>false</MinimalRebuild>
@@ -169,7 +169,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;WIN32;NDEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;_ARCH_32=1;WIN32;NDEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../common;..;../ext/native;../ext/native/ext/glew;../ext/zlib;../ext/native/ext</AdditionalIncludeDirectories>
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <FavorSizeOrSpeed>Speed</FavorSizeOrSpeed>
@@ -196,7 +196,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;WIN32;NDEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>USING_WIN_UI;_CRT_SECURE_NO_WARNINGS;_ARCH_64=1;WIN32;NDEBUG;_LIB;_UNICODE;UNICODE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../common;..;../ext/native;../ext/native/ext/glew;../ext/zlib;../ext/native/ext</AdditionalIncludeDirectories>
       <BufferSecurityCheck>false</BufferSecurityCheck>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -217,4 +217,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>