diff --git a/include/vmr9.idl b/include/vmr9.idl
index 98524b0e75c..526cfbd8d93 100644
--- a/include/vmr9.idl
+++ b/include/vmr9.idl
@@ -518,6 +518,7 @@ interface IVMRImageCompositor9 : IUnknown
 {
     HRESULT InitCompositionDevice([in] IUnknown *d3ddev);
     HRESULT TermCompositionDevice([in] IUnknown *d3ddev);
+    HRESULT SetStreamMediaType([in] DWORD stream, [in] AM_MEDIA_TYPE *mt, [in] BOOL texture);
     HRESULT CompositeImage([in] IUnknown *d3ddev, [in] IDirect3DSurface9 *d3dtarget, [in] AM_MEDIA_TYPE *mttarget,
                            [in] REFERENCE_TIME start, [in] REFERENCE_TIME stop, D3DCOLOR back,
                            [in] VMR9VideoStreamInfo *info, [in] UINT streams);