diff --git a/ttd.vcproj b/ttd.vcproj
index 5d5673c17a..643ab8f40d 100644
--- a/ttd.vcproj
+++ b/ttd.vcproj
@@ -28,7 +28,7 @@
 				FavorSizeOrSpeed="2"
 				OmitFramePointers="TRUE"
 				OptimizeForProcessor="1"
-				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_SDL;WITH_ZLIB;WITH_PNG"
+				PreprocessorDefinitions="WIN32;NDEBUG;_CONSOLE;WIN32_EXCEPTION_TRACKER;WIN32_ENABLE_DIRECTMUSIC_SUPPORT;WITH_ZLIB;WITH_PNG"
 				StringPooling="TRUE"
 				ExceptionHandling="FALSE"
 				RuntimeLibrary="4"
@@ -45,7 +45,7 @@
 				ProgramDataBaseFileName=".\Release/"
 				BrowseInformation="1"
 				WarningLevel="3"
-				WarnAsError="FALSE"
+				WarnAsError="TRUE"
 				SuppressStartupBanner="TRUE"
 				DebugInformationFormat="3"
 				CompileAs="1"/>
@@ -119,7 +119,7 @@
 				ProgramDataBaseFileName=".\Checked/"
 				BrowseInformation="1"
 				WarningLevel="3"
-				WarnAsError="FALSE"
+				WarnAsError="TRUE"
 				SuppressStartupBanner="TRUE"
 				DebugInformationFormat="3"
 				CallingConvention="1"
@@ -174,7 +174,6 @@
 			CharacterSet="2">
 			<Tool
 				Name="VCCLCompilerTool"
-				AdditionalOptions="/D &quot;WITH_SDL&quot;"
 				Optimization="0"
 				PreprocessorDefinitions="WIN32;_DEBUG;_CONSOLE;WITH_ZLIB;WITH_PNG"
 				BasicRuntimeChecks="3"
@@ -186,7 +185,7 @@
 				ObjectFile=".\Debug/"
 				ProgramDataBaseFileName=".\Debug/"
 				WarningLevel="3"
-				WarnAsError="FALSE"
+				WarnAsError="TRUE"
 				SuppressStartupBanner="TRUE"
 				Detect64BitPortabilityProblems="FALSE"
 				DebugInformationFormat="4"