diff --git a/libs/portaudio/build/msvc/portaudio.2008.vcproj b/libs/portaudio/build/msvc/portaudio.2008.vcproj
index 222ad3f6d2..d7749bcb92 100644
--- a/libs/portaudio/build/msvc/portaudio.2008.vcproj
+++ b/libs/portaudio/build/msvc/portaudio.2008.vcproj
@@ -393,7 +393,7 @@
 				Name="VCCLCompilerTool"
 				Optimization="0"
 				AdditionalIncludeDirectories="..\..\src\common,..\..\include,.\,..\..\src\os\win"
-				PreprocessorDefinitions="WIN32;_DEBUG;_USRDLL;PA_ENABLE_DEBUG_OUTPUT;_CRT_SECURE_NO_DEPRECATE;PAWIN_USE_WDMKS_DEVICE_INFO"
+				PreprocessorDefinitions="WIN32;_DEBUG;_USRDLL;PA_ENABLE_DEBUG_OUTPUT;_CRT_SECURE_NO_DEPRECATE;PA_NO_ASIO;PAWIN_USE_WDMKS_DEVICE_INFO"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
 				RuntimeLibrary="3"
@@ -583,7 +583,7 @@
 				Optimization="2"
 				InlineFunctionExpansion="1"
 				AdditionalIncludeDirectories="..\..\src\common,..\..\include,.\,..\..\src\os\win"
-				PreprocessorDefinitions="WIN32;NDEBUG;_USRDLL;PA_ENABLE_DEBUG_OUTPUT;_CRT_SECURE_NO_DEPRECATE"
+				PreprocessorDefinitions="WIN32;NDEBUG;_USRDLL;PA_ENABLE_DEBUG_OUTPUT;_CRT_SECURE_NO_DEPRECATE;PA_NO_ASIO"
 				StringPooling="true"
 				RuntimeLibrary="2"
 				EnableFunctionLevelLinking="true"