diff --git a/src/windows/libespeak-ng.vcxproj b/src/windows/libespeak-ng.vcxproj
index 1ea3935d..9c5979e9 100644
--- a/src/windows/libespeak-ng.vcxproj
+++ b/src/windows/libespeak-ng.vcxproj
@@ -88,7 +88,7 @@
       <WarningLevel>TurnOffAllWarnings</WarningLevel>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>$(ProjectDir);$(ProjectDir)/../include;$(ProjectDir)/../pcaudiolib/src/include;$(ProjectDir)/../speechPlayer/include;$(ProjectDir)/../include/compat;$(ProjectDir)/../ucd-tools/src/include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;INCLUDE_KLATT;INCLUDE_SPEECHPLAYER;INCLUDE_MBROLA;HAVE_PCAUDIOLIB_AUDIO_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;USE_KLATT=1;USE_SPEECHPLAYER=1;USE_MBROLA=1;USE_LIBPCAUDIO=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ProgramDataBaseFileName>$(IntDir)libespeak-ng.pdb</ProgramDataBaseFileName>
     </ClCompile>
     <Link>
@@ -104,7 +104,7 @@
       </PrecompiledHeader>
       <WarningLevel>TurnOffAllWarnings</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;INCLUDE_KLATT;INCLUDE_SPEECHPLAYER;INCLUDE_MBROLA;HAVE_PCAUDIOLIB_AUDIO_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;USE_KLATT=1;USE_SPEECHPLAYER=1;USE_MBROLA=1;USE_LIBPCAUDIO=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ProgramDataBaseFileName>$(IntDir)libespeak-ng.pdb</ProgramDataBaseFileName>
       <AdditionalIncludeDirectories>$(ProjectDir);$(ProjectDir)/../include;$(ProjectDir)/../pcaudiolib/src/include;$(ProjectDir)/../speechPlayer/include;$(ProjectDir)/../include/compat;$(ProjectDir)/../ucd-tools/src/include</AdditionalIncludeDirectories>
     </ClCompile>
@@ -124,7 +124,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <AdditionalIncludeDirectories>$(ProjectDir);$(ProjectDir)/../include;$(ProjectDir)/../pcaudiolib/src/include;$(ProjectDir)/../speechPlayer/include;$(ProjectDir)/../include/compat;$(ProjectDir)/../ucd-tools/src/include</AdditionalIncludeDirectories>
-      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;INCLUDE_KLATT;INCLUDE_SPEECHPLAYER;INCLUDE_MBROLA;HAVE_PCAUDIOLIB_AUDIO_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;USE_KLATT=1;USE_SPEECHPLAYER=1;USE_MBROLA=1;USE_LIBPCAUDIO=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ProgramDataBaseFileName>$(IntDir)libespeak-ng.pdb</ProgramDataBaseFileName>
     </ClCompile>
     <Link>
@@ -144,7 +144,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;INCLUDE_KLATT;INCLUDE_SPEECHPLAYER;INCLUDE_MBROLA;HAVE_PCAUDIOLIB_AUDIO_H;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LIBESPEAK_NG_EXPORT;USE_KLATT=1;USE_SPEECHPLAYER=1;USE_MBROLA=1;USE_LIBPCAUDIO=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ProgramDataBaseFileName>$(IntDir)libespeak-ng.pdb</ProgramDataBaseFileName>
       <AdditionalIncludeDirectories>$(ProjectDir);$(ProjectDir)/../include;$(ProjectDir)/../pcaudiolib/src/include;$(ProjectDir)/../speechPlayer/include;$(ProjectDir)/../include/compat;$(ProjectDir)/../ucd-tools/src/include</AdditionalIncludeDirectories>
     </ClCompile>