Jimmy Kimmel and Jay Leno have ended their lengthy feud.

The late-night host told The Hollywood Reporter it was the birth of his infant son that broke the silence between the two men.

“Jay and I have made peace. After my son had his operation, he called me and he was very nice.”

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Kimmel’s son, William John, was born with a heart defect that required emergency surgery.

Looking back, Kimmel said the rivalry happened out of his love for David Letterman, who was in direct late-night competition with Leno.

“You have to remember how much I love David Letterman. When all that stuff happened, I was just a fan, reading Bill Carter’s book [1994’s “The Late Shift: Letterman, Leno, and the Network Battle for the Night”] and there was a villain and a hero, and Dave was the hero and Jay was the villain. I started off with a negative feeling about it. I sometimes insert myself into situations I have no business inserting myself into.”

But Kimmel has softened his stance on Leno since the kind-hearted phone call.

Related: Jimmy Kimmel Goes Political

“You can’t argue with [Leno’s] success and his longevity. I will say, when I was in high school and college, he was one of my all-time favorite comics.”

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