SPRINGFIELD — Unfortunately, butter doesn’t have a spell-check function.

The superintendent of the Illinois State Fair’s Dairy Building says the misspelling of the word “bicentennial” on the fair’s famed Butter Cow display will be repaired before big crowds hit the building this weekend to view the spinning refrigerated case holding the 600-pound creation.

Marla Behrends, the Dairy Building’s superintendent, said workers at the building were expecting to complete the fix Thursday evening.

Behrends said the Butter Cow’s sculptor, Sarah Pratt of West Des Moines, Iowa, felt terrible and was very sorry when she was informed about the mistake, which happened on a butter-based sign sitting next to the cow. The sign includes the word “bicenntenial,” with one of the buttery Ns in the wrong place.

No other officials at the fair noticed the typo until after Pratt left town to work on other butter displays she does for other fairs around the country. Some eagle-eyed Butter Cow fans were pointing out the error on social media Wednesday after the display was unveiled to the public.

“There’s just not spell check in butter,” Behrends said.

The Butter Cow has been part of the Illinois State Fair for more than 90 years.