Right side of turret sprite is facing mouse rather than the front of the turret

Basically the title explains it.

I’ve got a turret sprite that I want the front (barrel side) of to face my mouse.

Unfortunately what is actually occurring is the right side is facing the mouse instead.

Here is a GIF of whats occuring:

void Update()
    {
Vector3 mousePos = Input.mousePosition;
mousePos.z = 5.23f;

Vector3 objectPos = Camera.main.WorldToScreenPoint (transform.position);
mousePos.x = mousePos.x - objectPos.x;
mousePos.y = mousePos.y - objectPos.y;

float angle = Mathf.Atan2(mousePos.y, mousePos.x) * Mathf.Rad2Deg;
transform.rotation = Quaternion.Euler(new Vector3(0, 0, angle));

}

It looks like your default turret rotation is facing up, but a 0 degree mouse angle is to the right if you use Tan(y/x). Either rotate the sprite so that a rotation of 0 faces right or just subtract 90 degrees from your calculated angle.