diff --git a/projects/VC7.1/FlightGear.vcproj b/projects/VC7.1/FlightGear.vcproj
index 1f8c1892f..d50d40f88 100755
--- a/projects/VC7.1/FlightGear.vcproj
+++ b/projects/VC7.1/FlightGear.vcproj
@@ -2028,6 +2028,12 @@
 			<File
 				RelativePath="..\..\src\Network\AV400.hxx">
 			</File>
+			<File
+				RelativePath="..\..\src\Network\AV400Sim.cxx">
+			</File>
+			<File
+				RelativePath="..\..\src\Network\AV400Sim.hxx">
+			</File>
 			<File
 				RelativePath="..\..\src\Network\garmin.cxx">
 			</File>