My seven year old with ADHD lies just to lie? What do I do?

My seven year old with ADHD lies just to lie. He does not do it just to get out of trouble, he will make up stories about any thing for any reason. He will also lie when he knows he was seen doing something bad, but he knows he was caught so he knows he is not going to avoid getting in to trouble. What can I do to get him to stop

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