diff --git a/cnc-ddraw.vcxproj b/cnc-ddraw.vcxproj
index d942c22..f74a7b3 100644
--- a/cnc-ddraw.vcxproj
+++ b/cnc-ddraw.vcxproj
@@ -210,7 +210,7 @@
       </PrecompiledHeader>
       <WarningLevel>Level2</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;WIN32;_DEBUG;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;WIN32;_DEBUG;_DEBUG_X;_WINDOWS;_USRDLL;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <AdditionalIncludeDirectories>inc;src\detours</AdditionalIncludeDirectories>
     </ClCompile>