The author praised showrunners David Benioff and Dan Weiss, but admitted that he is "greedy" and always wants more visual spectacle.
© HBO
"The show is quite faithful to the books, for the most part," he told Vulture. "But David Benioff and Dan Weiss... it's really their baby.
"They have a very difficult job of trying to tell my story within ten hours [per season], with the limitations of budget. So I understand why many of the changes that are made are made."
Martin described the action-packed episode 'Blackwater' as "spectacular" but admitted that it did not quite match his expectations.
"I'm very, very pleased by the way that episode came out," he insisted. "Nonetheless, would I have liked more? Sure, I would have liked more. I'm very greedy.
"But if we had added [more] to the Battle of Blackwater Bay, we'd still be shooting it! It would've been impossible - you have to take reality into account."
Martin recently expressed concerns that HBO is producing Game of Thrones faster than he can write his novels, calling the adaptation a "locomotive... bearing down".
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Watch a video recap of the Game of Thrones episode 'Blackwater' below:
