diff --git a/include/dxgi.idl b/include/dxgi.idl
index e74b525b1e7..d87a72c97de 100644
--- a/include/dxgi.idl
+++ b/include/dxgi.idl
@@ -190,6 +190,18 @@ interface IDXGIResource : IDXGIDeviceSubObject
     HRESULT GetEvictionPriority([out, retval] UINT *pEvictionPriority);
 }
 
+[
+    object,
+    uuid(9d8e1289-d7b3-465f-8126-250e349af85d),
+    local,
+    pointer_default(unique)
+]
+interface IDXGIKeyedMutex : IDXGIDeviceSubObject
+{
+    HRESULT AcquireSync([in] UINT64 Key, [in] DWORD dwMilliseconds);
+    HRESULT ReleaseSync([in] UINT64 Key);
+}
+
 [
     object,
     local,