Wear earplugs. One of these days it won't go away.
I remember being concerned about the ringing in my ears after shooting my Dad's .308 when I was around eleven or twelve. "Don't worry, that'll go away," my uncle told me.
And sure enough, after some time, it did. But then a year or two later when I was blasting away with a shotgun (perhaps emboldened by previously witnessing that any ringing 'would go away'), it didn't...