Bug in recursive function

I'm trying to get a pin number with only 4 digits. But the numbers that are less than 1000 are also getting printed. What is happening in this code?

import java.util.Random;

public class Util {

    public static int getRandomPINNumber(){
        Random randomGenerator = new Random();
        int randomNo = randomGenerator.nextInt(10000);
        if(randomNo < 1000)
        getRandomPINNumber(); //repeat if it is less than 1000,some bug here
        return randomNo;
    }

    public static void main(String[] args){
        for(int i = 0;i<100; i++)
            System.out.println(getRandomPINNumber());
    }

}

Output

6413
1692
5734
105  <--- why 105 is getting printed, it should reevaluate the pin right? 
4857
6348
1355