diff --git a/ports/win32/msvc8/libcheck.vcproj b/ports/win32/msvc8/libcheck.vcproj
index 8c0889a..6f7a40c 100644
--- a/ports/win32/msvc8/libcheck.vcproj
+++ b/ports/win32/msvc8/libcheck.vcproj
@@ -40,7 +40,7 @@
 				Name="VCCLCompilerTool"
 				Optimization="0"
 				AdditionalIncludeDirectories="..\check;..\..\..\..\check\src"
-				PreprocessorDefinitions="HAVE_CONFIG_H"
+				PreprocessorDefinitions="_LIB;WIN32;_DEBUG;HAVE_CONFIG_H"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
 				RuntimeLibrary="1"
@@ -103,7 +103,7 @@
 				Optimization="2"
 				EnableIntrinsicFunctions="true"
 				AdditionalIncludeDirectories="..\check;..\..\..\..\check\src"
-				PreprocessorDefinitions="HAVE_CONFIG_H"
+				PreprocessorDefinitions="WIN32;NDEBUG;_LIB;HAVE_CONFIG_H"
 				RuntimeLibrary="2"
 				EnableFunctionLevelLinking="true"
 				WarningLevel="3"
@@ -199,13 +199,6 @@
 			<File
 				RelativePath="..\..\..\..\check\src\check_log.c"
 				>
-				<FileConfiguration
-					Name="Debug|Win32"
-					>
-					<Tool
-						Name="VCCLCompilerTool"
-					/>
-				</FileConfiguration>
 			</File>
 			<File
 				RelativePath="..\..\..\..\check\src\check_log.h"
diff --git a/ports/win32/msvc8/lwip_unittests.vcproj b/ports/win32/msvc8/lwip_unittests.vcproj
index 3006e8c..cf968f8 100644
--- a/ports/win32/msvc8/lwip_unittests.vcproj
+++ b/ports/win32/msvc8/lwip_unittests.vcproj
@@ -39,7 +39,8 @@
 			<Tool
 				Name="VCCLCompilerTool"
 				Optimization="0"
-				AdditionalIncludeDirectories="..\check;..\..\..\..\check\src;$(LWIP_DIR)\src\include,$(LWIP_DIR)\src\include\ipv4,..\include,.."
+				AdditionalIncludeDirectories="..\check;..\..\..\..\check\src;&quot;$(LWIP_DIR)\src\include&quot;;&quot;$(LWIP_DIR)\src\include\ipv4&quot;;&quot;$(LWIP_DIR)\src\include\ipv6&quot;;..\include;.."
+				PreprocessorDefinitions="_LIB;WIN32;_DEBUG;LWIP_DEBUG"
 				MinimalRebuild="true"
 				BasicRuntimeChecks="3"
 				RuntimeLibrary="1"
@@ -109,7 +110,8 @@
 				Name="VCCLCompilerTool"
 				Optimization="2"
 				EnableIntrinsicFunctions="true"
-				AdditionalIncludeDirectories="..\check;..\..\..\..\check\src;$(LWIP_DIR)\src\include,$(LWIP_DIR)\src\include\ipv4,..\include,.."
+				AdditionalIncludeDirectories="..\check;..\..\..\..\check\src;&quot;$(LWIP_DIR)\src\include&quot;;&quot;$(LWIP_DIR)\src\include\ipv4&quot;;&quot;$(LWIP_DIR)\src\include\ipv6&quot;;..\include;.."
+				PreprocessorDefinitions="WIN32;NDEBUG;_LIB"
 				RuntimeLibrary="2"
 				EnableFunctionLevelLinking="true"
 				WarningLevel="4"