diff --git a/common/vsprops/CommonLibrary.props b/common/vsprops/CommonLibrary.props
index 4e33ef29a6..750d3e8c30 100644
--- a/common/vsprops/CommonLibrary.props
+++ b/common/vsprops/CommonLibrary.props
@@ -13,6 +13,8 @@
     <ClCompile>
       <AdditionalIncludeDirectories>$(SvnRootDir)\common\include\$(ProjectName);$(SvnRootDir)\common\include;$(SvnRootDir)\3rdparty\wxwidgets3.0\include;$(SvnRootDir)\3rdparty;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <PreprocessorDefinitions>__WIN32__;WIN32;_WINDOWS;_CRT_SECURE_NO_WARNINGS;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions Condition="'$(Platform)'=='x64'">_ARCH_64=1;_M_X86_64;__M_X86_64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions Condition="'$(Platform)'=='Win32'">_ARCH_32=1;_M_X86_32;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <StructMemberAlignment>16Bytes</StructMemberAlignment>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <RuntimeTypeInfo>false</RuntimeTypeInfo>
diff --git a/pcsx2/windows/VCprojects/vsprops/common.props b/pcsx2/windows/VCprojects/vsprops/common.props
index a817dfbc38..cff9734b8c 100644
--- a/pcsx2/windows/VCprojects/vsprops/common.props
+++ b/pcsx2/windows/VCprojects/vsprops/common.props
@@ -18,7 +18,7 @@
       <PrecompiledHeaderOutputFile>$(IntDir)pcsx2.pch</PrecompiledHeaderOutputFile>
       <CompileAs>Default</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
-      <PreprocessorDefinitions Condition="'$(Platform)'=='x64'">_ARCH_64=1;_M_X86_64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions Condition="'$(Platform)'=='x64'">_ARCH_64=1;_M_X86_64;__M_X86_64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='Win32'">_ARCH_32=1;_M_X86_32;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>