MovePosition not exact inside FixedUpdate()

Hi, I'm using MovePosition to make my 2D sprite "fly" toward the mouse position. I call MovePosition inside FixedUpdate, and it works to some extent, moving the sprite to the approximate location of the mouse. However, I noticed by logging the position of the sprite that it never quite reaches the destination, usually stopping .2 units short on the y axis.

I call this function from FixedUpdate:

Code (CSharp):

1.     protected bool moveToMouse(Vector3 mousePos)
2.     {
3.         float sqrRemainingDistance = (mousePos - transform.position).sqrMagnitude;
4.         Debug.Log("mouse position: " + mousePos + " duck position: " + transform.position);
5.         if (sqrRemainingDistance > .1f)
6.         {
7.             Vector3 destVector = mousePos - transform.position;
8.             Debug.Log(destVector.normalized);
9.             rb2d.MovePosition(transform.position + destVector.normalized * Time.fixedDeltaTime); //completes 1 unit movement per second
10.             return false;
11.         }
12.         Debug.Log("movement over");
13.         return true;
14.     }

But it never returns true. It gets stuck short of the destination:

mouse position: (-5.8, -2.7, -1.1) duck position: (-5.9, -2.9, 0.0)