diff --git a/include/mfidl.idl b/include/mfidl.idl
index b1568b9b56c..7d3dae0cbb3 100644
--- a/include/mfidl.idl
+++ b/include/mfidl.idl
@@ -715,6 +715,20 @@ interface IMFMediaSink : IUnknown
     HRESULT Shutdown();
 }
 
+[
+    object,
+    uuid(eaecb74a-9a50-42ce-9541-6a7f57aa4ad7),
+    local
+]
+interface IMFFinalizableMediaSink : IMFMediaSink
+{
+    HRESULT BeginFinalize(
+        [in] IMFAsyncCallback *callback,
+        [in] IUnknown *state);
+
+    HRESULT EndFinalize([in] IMFAsyncResult *result);
+}
+
 [
     object,
     uuid(0a97b3cf-8e7c-4a3d-8f8c-0c843dc247fb),