Watir, locate element by custom attribute

I am using Watir 6.16 and I have come across this line of code

<div data-guid="SearchTitle" class="acme"></div>

Not sure how to locate such an element in Watir, I have tried this -

element(:search_title, custom_attribute: "SearchTitle")

But this returns nothing, so am I forced to use xpath or is there another way?

Kev