MC facing mouse with tween

Hey guys,
I’m trying to get a MC to rotate to face the mouse using tween:


import flash.events.MouseEvent;
import fl.transitions.Tween;

stage.addEventListener(MouseEvent.CLICK,clicks);

var tween:Tween;

function clicks(e:MouseEvent):void {
	var dx:Number = mouseX-mc.x;
	var dy:Number = mouseY-mc.y;
	var angle:Number = Math.atan2(dy,dx)*180/Math.PI+90;
	tween = new Tween(mc,"rotation",null,mc.rotation,angle,5);
}

While this works fine, there are certain clicks which make the MC pick the longer route to rotate.
I suck at math and trig… can anyone lend a hand?