diff --git a/include/dxgi.idl b/include/dxgi.idl
index dd163096295..cc989708aab 100644
--- a/include/dxgi.idl
+++ b/include/dxgi.idl
@@ -69,7 +69,8 @@ const UINT DXGI_ENUM_MODES_SCALING                  = 2;
 typedef enum DXGI_SWAP_EFFECT {
     DXGI_SWAP_EFFECT_DISCARD    = 0,
     DXGI_SWAP_EFFECT_SEQUENTIAL = 1,
-    DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL = 3
+    DXGI_SWAP_EFFECT_FLIP_SEQUENTIAL = 3,
+    DXGI_SWAP_EFFECT_FLIP_DISCARD = 4
 } DXGI_SWAP_EFFECT;
 
 typedef enum DXGI_RESIDENCY {