diff --git a/win/vc90/BBGE.vcproj b/win/vc90/BBGE.vcproj
index a335f92..20be0d9 100644
--- a/win/vc90/BBGE.vcproj
+++ b/win/vc90/BBGE.vcproj
@@ -351,6 +351,14 @@
 				RelativePath="..\..\BBGE\MathFunctions.h"
 				>
 			</File>
+			<File
+				RelativePath="..\..\BBGE\MT.cpp"
+				>
+			</File>
+			<File
+				RelativePath="..\..\BBGE\MT.h"
+				>
+			</File>
 			<File
 				RelativePath="..\..\BBGE\OpenGLStubs.h"
 				>