diff --git a/include/d3d12.idl b/include/d3d12.idl
index 19e28c0e..94abf577 100644
--- a/include/d3d12.idl
+++ b/include/d3d12.idl
@@ -1406,6 +1406,7 @@ typedef enum D3D12_CLEAR_FLAGS
     D3D12_CLEAR_FLAG_DEPTH = 0x1,
     D3D12_CLEAR_FLAG_STENCIL = 0x2,
 } D3D12_CLEAR_FLAGS;
+cpp_quote("DEFINE_ENUM_FLAG_OPERATORS(D3D12_CLEAR_FLAGS);")
 
 typedef struct D3D12_DISCARD_REGION
 {