diff --git a/desmume/src/windows/DeSmuME_2005.vcproj b/desmume/src/windows/DeSmuME_2005.vcproj
index 262333006..405b81437 100644
--- a/desmume/src/windows/DeSmuME_2005.vcproj
+++ b/desmume/src/windows/DeSmuME_2005.vcproj
@@ -51,7 +51,7 @@
 				EnableFiberSafeOptimizations="false"
 				WholeProgramOptimization="false"
 				AdditionalIncludeDirectories=".;..;.\zlib123;.\zziplib;.\gdiplus"
-				PreprocessorDefinitions="_CRT_SECURE_NO_DEPRECATE;WIN32;BETA_VERSION;SPU_INTERPOLATE;HAVE_LIBZ;NOMINMAX;DEBUG;WANTPROGINFO"
+				PreprocessorDefinitions="_CRT_SECURE_NO_DEPRECATE;WIN32;BETA_VERSION;SPU_INTERPOLATE;HAVE_LIBZ;HAVE_LIBZZIP;NOMINMAX;DEBUG;WANTPROGINFO"
 				ExceptionHandling="1"
 				BufferSecurityCheck="false"
 				EnableEnhancedInstructionSet="0"