diff --git a/projects/VC7.1/SimGear.vcproj b/projects/VC7.1/SimGear.vcproj
index cbe0705d..f9c17d42 100755
--- a/projects/VC7.1/SimGear.vcproj
+++ b/projects/VC7.1/SimGear.vcproj
@@ -133,6 +133,9 @@
 		<Filter
 			Name="Lib_sgdebug"
 			Filter="">
+			<File
+				RelativePath="..\..\simgear\debug\debug_types.h">
+			</File>
 			<File
 				RelativePath="..\..\simgear\debug\logstream.cxx">
 			</File>