Anyone else have problem with update() in ContentResolver?

I have some extremely simple code--I just want to update the PHOTO
column of the People content provider.

private void updatePhoto(int id, String uri)
{
ContentValues cv = new ContentValues();
cv.put(People.PHOTO, uri);
int x = getContentResolver().update(People.CONTENT_URI,cv,People._ID
+"="+id, null);
Log.d("PhotoUpdater",x+" row(s) updated.");
}

public void onCreate(Bundle icicle) {
super.onCreate(icicle);
updatePhoto(14,"http://www.homepage.com/brandon.jpg");
}

I am 100% confident I have a contact with ID 14, so why is my row not
updated?? Bug??

James