diff --git a/build/WinStd.props b/build/WinStd.props
index 666d3e9e..d65987cd 100644
--- a/build/WinStd.props
+++ b/build/WinStd.props
@@ -15,6 +15,11 @@
       <LinkTimeCodeGeneration>false</LinkTimeCodeGeneration>
     </Lib>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
+    <Lib>
+      <AdditionalOptions>/IGNORE:4221 %(AdditionalOptions)</AdditionalOptions>
+    </Lib>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\src\Base64.cpp" />
     <ClCompile Include="..\src\COM.cpp" />