diff --git a/build/vs2010/Lol.Core.Rules.props b/build/vs2010/Lol.Core.Rules.props
index 505c3702..5e975bb0 100644
--- a/build/vs2010/Lol.Core.Rules.props
+++ b/build/vs2010/Lol.Core.Rules.props
@@ -12,7 +12,7 @@
       <AdditionalIncludeDirectories>$(SolutionDir)\..\..\src;$(FlexIncludes);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalIncludeDirectories Condition="'$(Platform)'=='Win32'">$(GlIncludes);$(SdlIncludes);$(D3d9Includes);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <AdditionalIncludeDirectories Condition="'$(Platform)'=='x64'">$(GlIncludes);$(SdlIncludes);$(D3d9Includes);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>NOMINMAX;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NOMINMAX;_CRT_SECURE_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='Win32'">WIN32;$(Win32Defines);%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='x64'">WIN32;$(Win32Defines);%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <PreprocessorDefinitions Condition="'$(Platform)'=='Xbox 360'">_XBOX;$(XboxDefines);%(PreprocessorDefinitions)</PreprocessorDefinitions>