diff --git a/src/conio/conio.vcxproj b/src/conio/conio.vcxproj
index 7de54589694f279a0ce4abf849f1e970c36a9958..c274867e9c4ce4602bfe9f5f27bc4cf3d022ead8 100644
--- a/src/conio/conio.vcxproj
+++ b/src/conio/conio.vcxproj
@@ -63,7 +63,7 @@
       <Optimization>MaxSpeed</Optimization>
       <InlineFunctionExpansion>OnlyExplicitInline</InlineFunctionExpansion>
       <AdditionalIncludeDirectories>%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>NDEBUG;WIN32;_LIB;LINK_LIST_THREADSAFE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NDEBUG;WIN32;_LIB;LINK_LIST_THREADSAFE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;%(PreprocessorDefinitions);NO_X</PreprocessorDefinitions>
       <StringPooling>true</StringPooling>
       <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
@@ -92,7 +92,7 @@
       <AdditionalOptions>/Zm400  %(AdditionalOptions)</AdditionalOptions>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>_DEBUG;WIN32;_LIB;LINK_LIST_THREADSAFE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_DEBUG;WIN32;_LIB;LINK_LIST_THREADSAFE;_CRT_SECURE_NO_DEPRECATE;_CRT_NONSTDC_NO_DEPRECATE;%(PreprocessorDefinitions);NO_X</PreprocessorDefinitions>
       <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <PrecompiledHeaderOutputFile>.\msvc.win32.debug_mt/conio.pch</PrecompiledHeaderOutputFile>