The 2016 Schlotzskyís Bun Run takes place Sunday at The Domain. Photo courtesy Schlotzskyís

The cityís oldest 5K gets winds its way through The Domain this Sunday.

The Schlotzskyís Bun Run moved from spring to fall and switched from a downtown route to the North Austin shopping center in 2014. Participation dropped from about 2,300 to less than 800 that first year, but the race appears to be slowly rebounding.

The Bun Run raises money for JDFR, which fights Type 1 diabetes. Photo courtesy Schlotzskyís

Registration climbed in 2015 and is tracking ahead of last year in 2016, organizers said Wednesday.

This yearís Bun Run includes a 5K timed race, plus a Kidís K for kids age 12 and under, a competition for Fastest Dog in Austin, and a team challenge. The certified course is fast and flat. Top male and female finishers win $250 each.

Since 2012, the event has raised more than $800,000 for JDFR, which works to improve the lives of those living with Type 1 diabetes and find a cure for the disease.

The race is part of a Step Up! Campaign at the sandwich shop. Customers who donate $1 for JDFR get a coupon for $1 off their next purchase.

Entry fee is $30 for the 5K (or $35 onsite Sunday morning), $15 for the Kidís K and $10 per dog. Register online by Thursday here or in-person at packet pickup.

The Kidís K starts at 8 a.m., followed by the 5K at 8:30 a.m. at 11401 Century Oaks in The Domain.