diff --git a/libmupen64plus/mupen64plus-audio-bkm/mupen64plus-audio-bkm/mupen64plus-audio-bkm.vcxproj b/libmupen64plus/mupen64plus-audio-bkm/mupen64plus-audio-bkm/mupen64plus-audio-bkm.vcxproj
index 209ca6d704..05c3ef34be 100644
--- a/libmupen64plus/mupen64plus-audio-bkm/mupen64plus-audio-bkm/mupen64plus-audio-bkm.vcxproj
+++ b/libmupen64plus/mupen64plus-audio-bkm/mupen64plus-audio-bkm/mupen64plus-audio-bkm.vcxproj
@@ -42,6 +42,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <AdditionalIncludeDirectories>..\..\mupen64plus-core\src\api;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;_DEBUG;_WINDOWS;_USRDLL;_CRT_SECURE_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>