diff --git a/projects/openttd_vs80.vcproj b/projects/openttd_vs80.vcproj
--- a/projects/openttd_vs80.vcproj
+++ b/projects/openttd_vs80.vcproj
@@ -811,6 +811,10 @@
 				>
 			</File>
 			<File
+				RelativePath=".\..\src\viewport_sprite_sorter_sse4.cpp"
+				>
+			</File>
+			<File
 				RelativePath=".\..\src\waypoint.cpp"
 				>
 			</File>
@@ -1839,6 +1843,10 @@
 				>
 			</File>
 			<File
+				RelativePath=".\..\src\viewport_sprite_sorter.h"
+				>
+			</File>
+			<File
 				RelativePath=".\..\src\viewport_type.h"
 				>
 			</File>