September 30, 2014 04:25 PM

Ben Affleck might be Batman, and he might have a hotly anticipated movie coming out Friday (that would be Gone Girl). But when it comes to his kids, all that matters is that Affleck can’t sing “Let It Go.”

“You can’t tell your son – ’cause you’re supposed to be his hero – that you can’t sing,” Affleck told Jimmy Fallon Monday on The Tonight Show before launching into a warbled, off-key version of the hit Frozen song that he belts out to his son, Samuel, 2.

In fact, Affleck added, Samuel actually loves Fallon’s Roots-accompanied rendition of “Let It Go” better than his pop’s.

“And now he’s started being like, ‘No, Papa. Do it like the man,’ ” Affleck said of the tyke’s preference for Fallon’s version.

Affleck headlines David Fincher’s adaptation of Gone Girl, which is sure to feature a paucity of musical numbers, and in a little over a year, you can see him don the Batsuit in Zack Snyder’s Batman v. Superman: Dawn of Justice.

Plenty of time to work on his own version of “Let It Go.”

RELATED: How Does Ben Affleck Relate to His Gone Girl Character?

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