diff --git a/PC/VS9.0/x64.vsprops b/PC/VS9.0/x64.vsprops
--- a/PC/VS9.0/x64.vsprops
+++ b/PC/VS9.0/x64.vsprops
@@ -8,7 +8,7 @@
 	>
 	<Tool
 		Name="VCCLCompilerTool"
-		AdditionalOptions="/USECL:MS_OPTERON /GS-"
+		AdditionalOptions="/GS-"
 		PreprocessorDefinitions="_WIN64;_M_X64"
 	/>
 	<Tool
diff --git a/PCbuild/x64.props b/PCbuild/x64.props
--- a/PCbuild/x64.props
+++ b/PCbuild/x64.props
@@ -5,7 +5,7 @@
   </PropertyGroup>
   <ItemDefinitionGroup>
     <ClCompile>
-      <AdditionalOptions>/USECL:MS_OPTERON /GS- %(AdditionalOptions)</AdditionalOptions>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
       <PreprocessorDefinitions>_WIN64;_M_X64;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>