This is not a prank: Krispy Kreme is offering one free glazed doughnut per customer on April Fools' Day.

Doughnut lovers can get their fix at the Penn Station location on Friday.

The free treat is available in honor of the “especially bountiful” and obviously fictitious “Doughnut Harvest.”

The company said in a news release that “the Doughnut Harvest yields hundreds of thousands of bushels of doughnettes -- each one carefully nurtured from a doughnut seedling, then individually selected by our master doughnut growers at the peak of freshness -- which are then brought into our shops for final glazing or hand-decorating.”