diff --git a/include/d3d11.idl b/include/d3d11.idl
index 262c9327c8..3ca697b4ce 100644
--- a/include/d3d11.idl
+++ b/include/d3d11.idl
@@ -543,6 +543,13 @@ typedef enum D3D11_DSV_FLAG
     D3D11_DSV_READ_ONLY_STENCIL = 0x2,
 } D3D11_DSV_FLAG;
 
+typedef enum D3D11_UAV_FLAG
+{
+    D3D11_BUFFER_UAV_FLAG_RAW     = 0x1,
+    D3D11_BUFFER_UAV_FLAG_APPEND  = 0x2,
+    D3D11_BUFFER_UAV_FLAG_COUNTER = 0x4,
+} D3D11_UAV_FLAG;
+
 typedef enum D3D11_INPUT_CLASSIFICATION
 {
     D3D11_INPUT_PER_VERTEX_DATA,