“Jurassic Park” is one of Steven Spielberg’s most iconic films, but while he was making it he started to resent the movie because he was working on it at the same time as “Schindler’s List.”

“I knew I had to be shooting in January in Poland, and so it came together awfully quickly, to the point that when I finally started shooting … in Poland, I had to go home about two or three times a week and get on a very crude satellite feed to Northern California … to be able to approve T-Rex shots,” Spielberg told the audience at a 25th anniversary screening of “Schindler’s List” on Thursday night.

Going back and forth between the Holocaust drama and the dinosaur blockbuster eventually took its toll on the famed director.

“It built a tremendous amount of resentment and anger that I had to do this,” he shared. “That I had to actually go from what [the “Schindler’s List” cast and crew] experienced to dinosaurs chasing Jeeps. All I can express is how angry that made me at the time.”

Of course, “Jurassic Park’s” box office success — it went on to make $1.03 billion worldwide — quickly made his anger dissipate.

“I was very grateful later in June, though,” he quipped. “Until then, it was a burden.”