diff --git a/headers/private/graphics/matrox/DriverInterface.h b/headers/private/graphics/matrox/DriverInterface.h
index fbd864972f..880bddd9fb 100644
--- a/headers/private/graphics/matrox/DriverInterface.h
+++ b/headers/private/graphics/matrox/DriverInterface.h
@@ -52,6 +52,7 @@ typedef struct {
 #define TV_NTSC (2<<9)
 #define TV_CAPABLE (1<<11)
 #define TV_VIDEO (1<<12)
+#define TV_PRIMARY (1<<13)
 
 #define SKD_MOVE_CURSOR    0x00000001
 #define SKD_PROGRAM_CLUT   0x00000002