diff --git a/projects/openttd_vs80.vcproj.in b/projects/openttd_vs80.vcproj.in
--- a/projects/openttd_vs80.vcproj.in
+++ b/projects/openttd_vs80.vcproj.in
@@ -52,7 +52,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs;..\objs\settings;..\src\3rdparty\squirrel\include"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_SSE;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
@@ -156,7 +156,7 @@
 				AdditionalOptions="/MP"
 				Optimization="0"
 				AdditionalIncludeDirectories="..\objs\langs;..\objs\settings;..\src\3rdparty\squirrel\include"
-				PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
+				PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_SSE;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\""
 				BasicRuntimeChecks="3"
 				RuntimeLibrary="1"
 				UsePrecompiledHeader="0"
@@ -257,7 +257,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="true"
 				AdditionalIncludeDirectories="..\objs\langs;..\objs\settings;..\src\3rdparty\squirrel\include"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";_SQ64;WITH_ASSERT"
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WITH_SSE;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";_SQ64;WITH_ASSERT"
 				StringPooling="true"
 				ExceptionHandling="1"
 				RuntimeLibrary="0"
@@ -362,7 +362,7 @@
 				AdditionalOptions="/MP"
 				Optimization="0"
 				AdditionalIncludeDirectories="..\objs\langs;..\objs\settings;..\src\3rdparty\squirrel\include"
-				PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";_SQ64"
+				PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;WITH_SSE;WITH_ZLIB;WITH_LZO;WITH_LZMA;LZMA_API_STATIC;WITH_PNG;WITH_FREETYPE;WITH_ICU;U_STATIC_IMPLEMENTATION;ENABLE_NETWORK;WITH_PERSONAL_DIR;PERSONAL_DIR=\"OpenTTD\";_SQ64"
 				BasicRuntimeChecks="3"
 				RuntimeLibrary="1"
 				UsePrecompiledHeader="0"