diff --git a/include/ntddvdeo.h b/include/ntddvdeo.h
index d2c078084ad..9523e37f7b4 100644
--- a/include/ntddvdeo.h
+++ b/include/ntddvdeo.h
@@ -20,5 +20,6 @@
 #define _NTDDVDEO_
 
 DEFINE_GUID(GUID_DEVINTERFACE_DISPLAY_ADAPTER, 0x5b45201d, 0xf2f2, 0x4f3b, 0x85, 0xbb, 0x30, 0xff, 0x1f, 0x95, 0x35, 0x99);
+DEFINE_GUID(GUID_DEVINTERFACE_MONITOR, 0xe6f07b5f, 0xee97, 0x4a90, 0xb0, 0x76, 0x33, 0xf5, 0x7b, 0xf4, 0xea, 0xa7);
 
 #endif