diff --git a/PC/VS9.0/x64.vsprops b/PC/VS9.0/x64.vsprops
index 9f88d443fe4..d06f470ceba 100644
--- a/PC/VS9.0/x64.vsprops
+++ b/PC/VS9.0/x64.vsprops
@@ -8,7 +8,7 @@
>
- /USECL:MS_OPTERON /GS- %(AdditionalOptions)
+ false
_WIN64;_M_X64;%(PreprocessorDefinitions)