It's stack sizes that dictate this one. Let's have a look at the raising point:
Pot size: $2.57
Effective stacks: $3.72

Call: PS = $3.37 ES = $3.72
Minraise: PS = $5.77 ES = $2.92

We all said $2 because minraises suck, but really a minraise is as big as you need to go to make an easy turn shove, thanks to the third man helping to build the pot. HU a 3x raise is goot but keep in mind you can tone it down with extra players commited.