diff --git a/include/mfobjects.idl b/include/mfobjects.idl
index 640cae88af6..33b4bbad008 100644
--- a/include/mfobjects.idl
+++ b/include/mfobjects.idl
@@ -702,6 +702,7 @@ cpp_quote("EXTERN_GUID(MF_BYTESTREAM_DURATION,           0xfc35828a,0x3cb6,0x460
 cpp_quote("EXTERN_GUID(MF_BYTESTREAM_LAST_MODIFIED_TIME, 0xfc35828b,0x3cb6,0x460c,0xa4,0x24,0xb6,0x68,0x12,0x60,0x37,0x5a);")
 cpp_quote("EXTERN_GUID(MF_BYTESTREAM_IFO_FILE_URI,       0xfc35828c,0x3cb6,0x460c,0xa4,0x24,0xb6,0x68,0x12,0x60,0x37,0x5a);")
 cpp_quote("EXTERN_GUID(MF_BYTESTREAM_DLNA_PROFILE_ID,    0xfc35828d,0x3cb6,0x460c,0xa4,0x24,0xb6,0x68,0x12,0x60,0x37,0x5a);")
+cpp_quote("EXTERN_GUID(MF_BYTESTREAM_EFFECTIVE_URL,      0x9afa0209,0x89d1,0x42af,0x84,0x56,0x1d,0xe6,0xb5,0x62,0xd6,0x91);")
 
 typedef enum MF_FILE_ACCESSMODE {
     MF_ACCESSMODE_READ      = 1,