Like Gen Z fashionistas donning vintage bucket hats, analysts are dusting off a credit metric that got overtaken by flashier figures during the ultra-low rate era: interest coverage.

Making sure a company generates enough earnings to comfortably service its debt has always been a fundamental part of credit analysis. Some might even say it’s pretty much what defines creditworthiness.

But in the heady days of the 2010s, when the economy was firing on all cylinders and debt was cheap and abundant, this particular aspect of credit analysis came to feel fussy and outmoded to some analysts.

Not anymore. As financial conditions tighten and investors become more selective, interest coverage is back in vogue.

“It’s really old-school,” said Michael Moore, a managing director at tech-focused investment bank Union Square Advisors. “It wasn’t a core focus when rates were low, but people are focusing on it now that interest rates have gone up.”