Robin Williams hasn't fallen off the wagon…he just wants to make sure it's nice and sturdy!

A rep for the 62-year-old confirms the actor has checked into Hazelden Addiction Treatment Center in Minnesota to help maintain his sobriety.

"After working back-to-back projects, Robin is simply taking the opportunity to fine-tune and focus on his continued commitment, of which he remains extremely proud," the rep tells TMZ. He is reportedly expected to remain in the facility for several weeks.

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In 2006, the Mork & Mindy star entered a substance abuse rehabilitation center in Oregon after admitting he was an alcoholic after two decades of sobriety.

At the time, his publicist said, "After 20 years of sobriety, Robin Williams found himself drinking again and has decided to take proactive measures to deal with this for his own well-being and the well-being of his family."

The comedian also battled a cocaine addiction in the late '70s and early '80s, but successfully quit after the death of his close friend John Belushi in 1982 and the birth of his son Zachary in 1983.

robin williams

Robin Williams (R) with Ben Stiller in "Night at the Museum" (2006)

"You can't [deal with it on your own]. That's the bottom line," Robin said about struggles with substance abuse. "You really think you can, then you realize, 'I need help,' and that's the word."

The Oscar winner has kept busy in reason months working on his latest film, Night at the Museum: Secret of the Tomb, which is expected to hit theaters later this year.