Advice on potty training bells

Hey everyone so I got my dog potty training bells and right now we’ve gotten to the point where he has used them successfully. But now he rings them just to go outside. I’m just asking if this is what I should be doing. If he uses the bells and goes potty, then when we come inside, I give him a treat. If he uses the bells and doesn’t go potty I try to bring him in the moment I realize he doesn’t have to go and I don’t give him a treat. Does anyone have any suggestions on how I should get him to stop ringing the bells just to go outside?