#include "libavutil/avassert.h"
-#include "dxva2_internal.h"
#include "hevc.h"
+// The headers above may include w32threads.h, which uses the original
+// _WIN32_WINNT define, while dxva2_internal.h redefines it to target a
+// potentially newer version.
+#include "dxva2_internal.h"
+
#define MAX_SLICES 256
struct hevc_dxva2_picture_context {