diff --git a/openttd.vcproj b/openttd.vcproj
index 955b0e90e8..3c527e6e64 100644
--- a/openttd.vcproj
+++ b/openttd.vcproj
@@ -48,6 +48,7 @@
 				WarnAsError="TRUE"
 				SuppressStartupBanner="TRUE"
 				DebugInformationFormat="3"
+				CallingConvention="1"
 				CompileAs="1"/>
 			<Tool
 				Name="VCCustomBuildTool"/>
@@ -114,7 +115,7 @@
 				SuppressStartupBanner="TRUE"
 				Detect64BitPortabilityProblems="FALSE"
 				DebugInformationFormat="4"
-				CallingConvention="0"
+				CallingConvention="1"
 				CompileAs="1"/>
 			<Tool
 				Name="VCCustomBuildTool"/>
@@ -739,15 +740,15 @@
 		<Filter
 			Name="AI Files"
 			Filter="">
-			<File
-				RelativePath=".\ai_new.h">
-			</File>
 			<File
 				RelativePath=".\ai_build.c">
 			</File>
 			<File
 				RelativePath=".\ai_new.c">
 			</File>
+			<File
+				RelativePath=".\ai_new.h">
+			</File>
 			<File
 				RelativePath=".\ai_pathfinder.c">
 			</File>