My die function gets called without me asking it.

I am pretty new to unity and i cant get this to work. I have a problem with my Script i have a Die function that gets called without a reason i can see? and i have not even put damage in the script either. please help me! this is my script made in c#.

using UnityEngine; using System.Collections;

public class Health : MonoBehaviour {

     int PlayerHealth = 100;

 void Update ()
 {
     if (PlayerHealth <= 0);
     {
         Die();
     }
 }

 void Die ()
 {
     print ("WTF!!");
 }

}