diff --git a/include/wmcodecdsp.idl b/include/wmcodecdsp.idl
index 809e528d7e2..2d74790179c 100644
--- a/include/wmcodecdsp.idl
+++ b/include/wmcodecdsp.idl
@@ -21,6 +21,9 @@ import "strmif.idl";
 
 cpp_quote("DEFINE_GUID(MEDIASUBTYPE_I420,0x30323449,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
 cpp_quote("DEFINE_GUID(MEDIASUBTYPE_MSAUDIO1,0x00000160,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("DEFINE_GUID(MEDIASUBTYPE_WMAUDIO2,0x00000161,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("DEFINE_GUID(MEDIASUBTYPE_WMAUDIO3,0x00000162,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
+cpp_quote("DEFINE_GUID(MEDIASUBTYPE_WMAUDIO_LOSSLESS,0x00000163,0x0000,0x0010,0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71);")
 
 [
     uuid(bbeea841-0a63-4f52-a7ab-a9b3a84ed38a)