diff --git a/projects/VC90/SimGear.vcproj b/projects/VC90/SimGear.vcproj
index 2db0dcc5..544fdb90 100644
--- a/projects/VC90/SimGear.vcproj
+++ b/projects/VC90/SimGear.vcproj
@@ -1025,6 +1025,14 @@
 				RelativePath="..\..\simgear\scene\model\CheckSceneryVisitor.hxx"
 				>
 			</File>
+			<File
+				RelativePath="..\..\simgear\scene\model\ConditionNode.cxx"
+				>
+			</File>
+			<File
+				RelativePath="..\..\simgear\scene\model\ConditionNode.hxx"
+				>
+			</File>
 			<File
 				RelativePath="..\..\simgear\scene\model\model.cxx"
 				>