How do you account for slippage in your risk sizing?

Been trying to get my risk management more dialed in, especially on the crypto side where volatility can really bite. I'm aiming for a fixed percentage of my account per trade, and setting my stop-loss accordingly. But I've noticed on some of the more illiquid altcoins, or even during sharp moves on something like $ETH, that my actual execution price on a stop can be significantly worse than my stated stop-loss level. This obviously blows out my planned risk. For those of you who have been trading these markets for a while, how do you practically factor in potential slippage when you're calculating your position size? Do you just use a wider stop, or adjust your calculated position size down to account for potential overshooting?