diff --git a/Subtrees/beast/Builds/VisualStudio2012/Beast.props b/Subtrees/beast/Builds/VisualStudio2012/Beast.props
index 1d61359a39..f6d2951a8e 100644
--- a/Subtrees/beast/Builds/VisualStudio2012/Beast.props
+++ b/Subtrees/beast/Builds/VisualStudio2012/Beast.props
@@ -6,7 +6,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <WarningLevel>Level4</WarningLevel>
-      <PreprocessorDefinitions>_CRTDBG_MAP_ALLOC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRTDBG_MAP_ALLOC;_WIN32_WINNT=0x0600;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
       <MinimalRebuild>false</MinimalRebuild>
     </ClCompile>