diff --git a/win_build/wrapper_vs2013.vcxproj b/win_build/wrapper_vs2013.vcxproj
index 6ef0137bc3..7a9426a33e 100644
--- a/win_build/wrapper_vs2013.vcxproj
+++ b/win_build/wrapper_vs2013.vcxproj
@@ -128,7 +128,6 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsCpp</CompileAs>
       <ForcedIncludeFiles>boinc_win.h;%(ForcedIncludeFiles)</ForcedIncludeFiles>
-      <CallingConvention>StdCall</CallingConvention>
     </ClCompile>
     <ResourceCompile>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -180,7 +179,6 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsCpp</CompileAs>
       <ForcedIncludeFiles>boinc_win.h;%(ForcedIncludeFiles)</ForcedIncludeFiles>
-      <CallingConvention>StdCall</CallingConvention>
       <WholeProgramOptimization>true</WholeProgramOptimization>
     </ClCompile>
     <ResourceCompile>
@@ -317,4 +315,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>