diff --git a/chuniio/chuniio.vcxproj b/chuniio/chuniio.vcxproj
index d5f47b1..ba8a99e 100644
--- a/chuniio/chuniio.vcxproj
+++ b/chuniio/chuniio.vcxproj
@@ -132,7 +132,7 @@
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>NDEBUG;CHUNIIO_EXPORTS;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
-      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
     </ClCompile>
     <Link>
diff --git a/chuniio_air.sln b/chuniio_air.sln
index 0cb36fe..eefc2ab 100644
--- a/chuniio_air.sln
+++ b/chuniio_air.sln
@@ -7,12 +7,18 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "chuniio", "chuniio\chuniio.
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x64 = Debug|x64
 		Debug|x86 = Debug|x86
+		Release|x64 = Release|x64
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Debug|x64.ActiveCfg = Debug|x64
+		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Debug|x64.Build.0 = Debug|x64
 		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Debug|x86.ActiveCfg = Debug|Win32
 		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Debug|x86.Build.0 = Debug|Win32
+		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Release|x64.ActiveCfg = Release|x64
+		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Release|x64.Build.0 = Release|x64
 		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Release|x86.ActiveCfg = Release|Win32
 		{2F7FFFC6-DF90-4A0E-A37A-314BD67AF685}.Release|x86.Build.0 = Release|Win32
 	EndGlobalSection