Java generic Observer Pattern implementation of unchecked call as raw type

I'm currently trying to use a generic implementation of the Observer pattern in Java, which seems to work quite well, except for the fact that it generates unverified call alerts that I would like to fix if possible. The implementation is as follows:

Interface, IObservable.java:

public interface IObservable<T> {
    void addObserver(IObserver<T> observer);
    void removeObserver(IObserver<T> observer);
}

Base class Observable.java:

import java.util.ArrayList;

public class Observable<T> implements IObservable<T> {
    private final ArrayList<IObserver<T>> observers
            = new ArrayList<IObserver<T>>();

    public void addObserver(IObserver<T> observer) {
        synchronized (observers) {
            observers.add(observer);
        }
    }

    public void removeObserver(IObserver<T> observer) {
        synchronized (observers) {
            observers.remove(observer);
        }
    }

    protected void notifyObservers(final T t) {
        synchronized (observers) {
            for (IObserver<T> observer : observers) {
                observer.notify(t);
            }
        }
    }
}

IObserver.java observer interface:

public interface IObserver<T> {
    void notify(T model);
}

My Observable class Subject.java:

public class Subject extends Observable {
    private int foo;
    private int bar;

    public int getFoo() { return foo; }
    public int getBar() { return bar; }

    public void setFoo(int f) {
        foo = f;
        notifyObservers(this);
    }

    public void setBar(int b) {
        bar = b;
        notifyObservers(this);
    }
}

Unverified call alerts occur on every call to notifyObservers. Full warning

java: warning: [unchecked] unchecked call to notifyObservers(T) as a member of the raw type com.foo.Observable

Is there a way to fix this, or should I just use @suppressWarnings ("unchecked")? Or maybe I should, like this safe method of calling?