diff --git a/projects/openttd_vs80.vcproj b/projects/openttd_vs80.vcproj
--- a/projects/openttd_vs80.vcproj
+++ b/projects/openttd_vs80.vcproj
@@ -643,6 +643,10 @@
 				>
 			</File>
 			<File
+				RelativePath=".\..\src\progress.cpp"
+				>
+			</File>
+			<File
 				RelativePath=".\..\src\rail.cpp"
 				>
 			</File>
@@ -1331,6 +1335,10 @@
 				>
 			</File>
 			<File
+				RelativePath=".\..\src\progress.h"
+				>
+			</File>
+			<File
 				RelativePath=".\..\src\querystring_gui.h"
 				>
 			</File>