diff --git a/sound.c b/sound.c
index f8b5de7da6..28055dee40 100644
--- a/sound.c
+++ b/sound.c
@@ -241,7 +241,7 @@ static bool MxSetBankSource(MixerChannel *mc, uint bank)
 	FioReadBlock(mem, fe->file_size);
 
 	for (i = 0; i != fe->file_size; i++)
-		mem[i] -= 128; // Convert unsigned sound data to signed
+		mem[i] += -128; // Convert unsigned sound data to signed
 
 	assert(fe->bits_per_sample == 8 && fe->channels == 1 && fe->file_size != 0 && fe->rate != 0);
 
diff --git a/ttd.dsp b/ttd.dsp
index 130eb7594d..1b8a672802 100644
--- a/ttd.dsp
+++ b/ttd.dsp
@@ -760,6 +760,10 @@ SOURCE=.\table\allstrings.h
 SOURCE=.\table\animcursors.h
 # End Source File
 
+# Begin Source File
+SOURCE=.\table\autorail.h
+# End Source File
+
 # Begin Source File
 SOURCE=.\table\build_industry.h
 # End Source File
diff --git a/ttd.vcproj b/ttd.vcproj
index 9a36f4c473..7023f7d90f 100644
--- a/ttd.vcproj
+++ b/ttd.vcproj
@@ -188,6 +188,7 @@
 				WarningLevel="3"
 				WarnAsError="TRUE"
 				SuppressStartupBanner="TRUE"
+				Detect64BitPortabilityProblems="FALSE"
 				DebugInformationFormat="4"
 				CallingConvention="0"
 				CompileAs="1"/>
@@ -2506,6 +2507,9 @@
 			<File
 				RelativePath=".\table\animcursors.h">
 			</File>
+			<File
+				RelativePath=".\table\autorail.h">
+			</File>
 			<File
 				RelativePath="table\build_industry.h">
 			</File>