diff --git a/include/d3d12.idl b/include/d3d12.idl
index 7c10e51e..a029747b 100644
--- a/include/d3d12.idl
+++ b/include/d3d12.idl
@@ -961,6 +961,7 @@ typedef enum D3D12_DSV_FLAGS
     D3D12_DSV_FLAG_READ_ONLY_DEPTH = 0x1,
     D3D12_DSV_FLAG_READ_ONLY_STENCIL = 0x2,
 } D3D12_DSV_FLAGS;
+cpp_quote("DEFINE_ENUM_FLAG_OPERATORS(D3D12_DSV_FLAGS);")
 
 typedef struct D3D12_TEX1D_DSV
 {