ASTON, P.a., (CBS) -- Calling all drive-thru customers! Dunkin' is onto you.

The fast food chain is opening a drive-thru exclusive restaurant Wednesday morning in Aston, Delaware County, along the Conchester Highway.

In typical Dunkin' fashion, customers who go to the exclusively-drive-thru restaurant Wednesday can get a free donut with the purchase of any beverage, as part of its grand opening celebration.

Don't let the sugar go to your head though. There's a limit of one free donut per guest.

The offer runs from 5 a.m. to 6 p.m.

This is the second dive-thru-only Dunkin' in the greater Philadelphia area.