[modern] Wind noise

I have noticed wind noise in my '88 XJ6 for some time and believed it was
coming from around the front passenger door. The other day my wife was
driving and I was the passenger and the sound seemed as though it was coming
from the drivers side. I finally figured out (duh!) that it has been coming
from the sun roof. The sliding roof seems to fit properly but must not be
quite tight enough. Is there a way to adjust it so that I can stop the wind

Thanks for any help,