update highscore if current is higher than previous score

in the script below, the highscore doesn't update at the start, if you have any help it will be appreciated. #pragma strict var High : int;

   function Start () {
     High = PlayerPrefs.GetInt("Highscore", 0); // again, second parameter is default if not found yet.
     guiText.text = "Highscore:" + High.ToString();
   }

the script that manages the score is this #pragma strict var Counter : int = 0;

   function addscore () {
     Counter += 1;
   }
   
   function Update () {
     Debug.Log("updated Guitext.text");
     guiText.text = "Score:" + Counter.ToString();
   }
   
   function endlevel (){
     var oldHighscore : int = PlayerPrefs.GetInt("Highscore", 0); // second parameter is for default value if not found in player prefs.
     
     if (Counter > oldHighscore) {
      PlayerPrefs.SetInt("Highscore", Counter); // if the current score(counter) is greater than the old highscore, then you have beaten it.
      PlayerPrefs.Save(); // After setting, save/commit the new value(s).
     }
     
     guiText.text = "Score:0";
     Counter = 0;
   }