Billionaire Warren Buffett says he is feeling fine more than a month after finishing his prostate cancer treatments.

Buffett said Wednesday during an interview on CNBC that he is feeling fine. Buffett disclosed his cancer diagnosis in April.

Buffett is Berkshire Hathaway’s chairman and chief executive. The 82-year-old has said he feels good and his cancer is not considered life-threatening because it was caught early.

Buffett underwent six weeks of radiation treatments for the cancer. He says the treatments were tiring.

Buffett finished the radiation treatments in September.