diff --git a/include/mfapi.h b/include/mfapi.h
index b4e4d095bb4..575b034c490 100644
--- a/include/mfapi.h
+++ b/include/mfapi.h
@@ -385,6 +385,7 @@ DEFINE_GUID(MFMediaType_Subtitle,          0xa6d13581, 0xed50, 0x4e65, 0xae, 0x0
 DEFINE_GUID(MFMediaType_Video,             0x73646976, 0x0000, 0x0010, 0x80, 0x00, 0x00, 0xaa, 0x00, 0x38, 0x9b, 0x71);
 
 DEFINE_GUID(MFSampleExtension_DecodeTimestamp,          0x73a954d4, 0x09e2, 0x4861, 0xbe, 0xfc, 0x94, 0xbd, 0x97, 0xc0, 0x8e, 0x6e);
+DEFINE_GUID(MFSampleExtension_CleanPoint,               0x9cdf01d8, 0xa0f0, 0x43ba, 0xb0, 0x77, 0xea, 0xa0, 0x6c, 0xbd, 0x72, 0x8a);
 DEFINE_GUID(MFSampleExtension_Timestamp,                0x1e436999, 0x69be, 0x4c7a, 0x93, 0x69, 0x70, 0x06, 0x8c, 0x02, 0x60, 0xcb);
 DEFINE_GUID(MFSampleExtension_Token,                    0x8294da66, 0xf328, 0x4805, 0xb5, 0x51, 0x00, 0xde, 0xb4, 0xc5, 0x7a, 0x61);
 DEFINE_GUID(MFSampleExtension_3DVideo,                  0xf86f97a4, 0xdd54, 0x4e2e, 0x9a, 0x5e, 0x55, 0xfc, 0x2d, 0x74, 0xa0, 0x05);