2d Turret WORKS but is turned 90 degrees from the right way

This script here works perfectly without error but its aim is off by 90 degrees

 using UnityEngine;
 using System.Collections;
 
 public class TurretRotate : MonoBehaviour {
     
     public Transform target;
     public float turretSpeed;
     public float fireRate;
     public float fireBallHeight;
     public GameObject fireBall;
     public float range;
     private float _lastShotTime = float.MinValue;
     float distance;
     
     // Use this for initialization
     void Start () 
     {
         
     }
     
     // Update is called once per frame
     void Update () 
     {
         //Rotate turret to look at player.
         Vector3 relativePos = target.position - transform.position;
         Quaternion rotation = Quaternion.LookRotation(relativePos); 
         rotation.x=0;
         rotation.y=0;
         transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * turretSpeed);
         
         //Fire at player when in range.
         distance = Vector3.Distance(transform.position,target.position);
         
         if (distance < range && Time.time > _lastShotTime + (3.0f / fireRate))
         {
             _lastShotTime = Time.time;
             launchFireBall();
         }  
     }
     
     void launchFireBall()
     {
         Vector3 position = new Vector3(transform.position.x, transform.position.y + fireBallHeight, transform.position.z);
         Instantiate(fireBall, position, transform.rotation);
     }
 }
 

How do I fix this?