diff --git a/projects/determineversion.vbs b/projects/determineversion.vbs
--- a/projects/determineversion.vbs
+++ b/projects/determineversion.vbs
@@ -272,8 +272,13 @@ Function IsCachedVersion(ByVal version)
 	End If
 End Function
 
+Function CheckFile(filename)
+	CheckFile = FSO.FileExists(filename) And (FSO.GetFile(filename).DateLastModified >= FSO.GetFile(filename & ".in").DateLastModified)
+End Function
+
 Dim version
 version = DetermineSVNVersion
-If Not (IsCachedVersion(version) And FSO.FileExists("../src/rev.cpp") And FSO.FileExists("../src/ottdres.rc")) Then
+If Not (IsCachedVersion(version) And CheckFile("../src/rev.cpp") And CheckFile("../src/ottdres.rc")) Then
+	wscript.echo "update"
 	UpdateFiles version
 End If
diff --git a/projects/version_vs80.vcproj b/projects/version_vs80.vcproj
--- a/projects/version_vs80.vcproj
+++ b/projects/version_vs80.vcproj
@@ -35,6 +35,10 @@
 	</References>
 	<Files>
 		<File
+			RelativePath="..\src\ottdres.rc.in"
+			>
+		</File>
+		<File
 			RelativePath="..\src\rev.cpp.in"
 			>
 		</File>
diff --git a/projects/version_vs90.vcproj b/projects/version_vs90.vcproj
--- a/projects/version_vs90.vcproj
+++ b/projects/version_vs90.vcproj
@@ -36,6 +36,10 @@
 	</References>
 	<Files>
 		<File
+			RelativePath="..\src\ottdres.rc.in"
+			>
+		</File>
+		<File
 			RelativePath="..\src\rev.cpp.in"
 			>
 		</File>