diff --git a/include/dxgi.idl b/include/dxgi.idl
index c14ef2c..9ac585a 100644
--- a/include/dxgi.idl
+++ b/include/dxgi.idl
@@ -212,7 +212,7 @@
     );
     HRESULT CheckInterfaceSupport(
         [in] REFGUID guid,
-        [out] LARGE_INTEGER umd_version
+        [out] LARGE_INTEGER *umd_version
     );
 }