diff --git a/projects/VC7.1/FlightGear.vcproj b/projects/VC7.1/FlightGear.vcproj
index 055290722..f4c414f74 100755
--- a/projects/VC7.1/FlightGear.vcproj
+++ b/projects/VC7.1/FlightGear.vcproj
@@ -24,7 +24,7 @@
 				Name="VCCLCompilerTool"
 				Optimization="0"
 				AdditionalIncludeDirectories="..\..\..;..\..\src;..\..\src\include;..\..\..\SimGear;..\..\src\FDM\JSBSim;..\..\..\install\msvc71\OpenSceneGraph\include;..\..\..\3rdParty\include;..\..\..\boost_1_36_0"
-				PreprocessorDefinitions="_DEBUG;WIN32;_CONSOLE;HAVE_CONFIG_H;FGFS;ENABLE_AUDIO_SUPPORT;_FG_NDEBUG;ENABLE_THREADS=1;FG_ENABLE_MULTIPASS_CLOUDS;ENABLE_SP_FMDS;_USE_MATH_DEFINES;FG_JPEG_SERVER;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS"
+				PreprocessorDefinitions="_DEBUG;WIN32;_CONSOLE;HAVE_CONFIG_H;FGFS;ENABLE_AUDIO_SUPPORT;_FG_NDEBUG;ENABLE_THREADS=1;FG_ENABLE_MULTIPASS_CLOUDS;ENABLE_SP_FMDS;_USE_MATH_DEFINES;FG_JPEG_SERVER;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS;PU_USE_NATIVE"
 				StringPooling="TRUE"
 				BasicRuntimeChecks="0"
 				RuntimeLibrary="3"
@@ -88,7 +88,7 @@
 				Name="VCCLCompilerTool"
 				InlineFunctionExpansion="1"
 				AdditionalIncludeDirectories="..\..\..;..\..\src;..\..\src\include;..\..\src\FDM\JSBSim;..\..\..\SimGear;..\..\..\install\msvc71\OpenSceneGraph\include;..\..\..\Producer\include;..\..\..\3rdParty\include;..\..\..\boost_1_36_0"
-				PreprocessorDefinitions="NDEBUG;WIN32;_CONSOLE;HAVE_CONFIG_H;FGFS;ENABLE_AUDIO_SUPPORT;_FG_NDEBUG;ENABLE_THREADS=1;FG_ENABLE_MULTIPASS_CLOUDS;ENABLE_SP_FMDS;_USE_MATH_DEFINES;FG_JPEG_SERVER;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS"
+				PreprocessorDefinitions="NDEBUG;WIN32;_CONSOLE;HAVE_CONFIG_H;FGFS;ENABLE_AUDIO_SUPPORT;_FG_NDEBUG;ENABLE_THREADS=1;FG_ENABLE_MULTIPASS_CLOUDS;ENABLE_SP_FMDS;_USE_MATH_DEFINES;FG_JPEG_SERVER;_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_WARNINGS;PU_USE_NATIVE"
 				StringPooling="TRUE"
 				RuntimeLibrary="2"
 				EnableFunctionLevelLinking="TRUE"