diff --git a/projects/openttd_vs80.vcproj b/projects/openttd_vs80.vcproj
index f28f0d69e6..5743be414e 100644
--- a/projects/openttd_vs80.vcproj
+++ b/projects/openttd_vs80.vcproj
@@ -61,7 +61,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
@@ -272,7 +272,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
diff --git a/projects/openttd_vs80.vcproj.in b/projects/openttd_vs80.vcproj.in
index 52b9e409be..6f6f07166f 100644
--- a/projects/openttd_vs80.vcproj.in
+++ b/projects/openttd_vs80.vcproj.in
@@ -61,7 +61,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
@@ -272,7 +272,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
diff --git a/projects/openttd_vs90.vcproj b/projects/openttd_vs90.vcproj
index 1032affd24..baf39bd52b 100644
--- a/projects/openttd_vs90.vcproj
+++ b/projects/openttd_vs90.vcproj
@@ -62,7 +62,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
@@ -270,7 +270,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
diff --git a/projects/openttd_vs90.vcproj.in b/projects/openttd_vs90.vcproj.in
index de5f233303..a256f40b58 100644
--- a/projects/openttd_vs90.vcproj.in
+++ b/projects/openttd_vs90.vcproj.in
@@ -62,7 +62,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
@@ -270,7 +270,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG;WITH_FREETYPE;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"