Agustinus Jenaru was working in an unfinished wooden bungalow on Rinca island on Saturday when the 2 metre (6.5ft) lizard entered and bit his left hand, Komodo National Park official Daniel Bolu Ngongo said.
Jenaru hit the jaws of the giant lizard for several seconds until it freed him. He was taken to a clinic for treatment of lacerations and a puncture wound.
Komodo dragons can be found in the wild only on the eastern Indonesian islands of Komodo, Padar and Rinca.
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