diff --git a/PCbuild/pyexpat.vcxproj b/PCbuild/pyexpat.vcxproj
index 99c7286b2bd..a2763f02063 100644
--- a/PCbuild/pyexpat.vcxproj
+++ b/PCbuild/pyexpat.vcxproj
@@ -59,7 +59,7 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <AdditionalIncludeDirectories>$(PySourcePath)Modules\expat;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>PYEXPAT_EXPORTS;HAVE_EXPAT_H;XML_NS;XML_DTD;BYTEORDER=1234;XML_CONTEXT_BYTES=1024;XML_STATIC;HAVE_MEMMOVE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;PYEXPAT_EXPORTS;HAVE_EXPAT_H;XML_STATIC;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemGroup>