United Kingdom, Nov. 20 -- Michael Urie says Harrison Ford's "cantankerous" persona is "just an act".

The 45-year-old actor has got to know the Hollywood legend on the set of comedy drama Shrinking, and he insisted the 83-year-old star is actually quite "silly" on set, despite a somewhat grumpy reputation.

He told PEOPLE magazine: "He's silly and makes work fun. He loves being [on set], he really, really loves being there.

"I know he seems cantankerous on the red carpet, [but] that's just an act. He's actually very sweet, and he loves being there."

Michael has also heaped praise on Harrison's commitment to his craft, and the care he puts into every scene.

He added: "He is a really careful actor, he's really thinking about the work. H...