diff --git a/projects/VC7.1/FlightGear.vcproj b/projects/VC7.1/FlightGear.vcproj
index 6c964217b..a627f9f55 100755
--- a/projects/VC7.1/FlightGear.vcproj
+++ b/projects/VC7.1/FlightGear.vcproj
@@ -1828,10 +1828,10 @@
 				RelativePath="..\..\src\Main\fg_io.hxx">
 			</File>
 			<File
-				RelativePath="..\..\src\Main\fg_os.hxx">
+				RelativePath="..\..\src\Main\fg_os.cxx">
 			</File>
 			<File
-				RelativePath="..\..\src\Main\fg_os_osgviewer.cxx">
+				RelativePath="..\..\src\Main\fg_os.hxx">
 			</File>
 			<File
 				RelativePath="..\..\src\Main\fg_props.cxx">