Graduates at a Southern California high school are getting one last laugh before saying goodbye after the school distributed diploma covers with a typo.

A graduating senior at Ontario High School posted a photo to Twitter that shows a diploma cover handed out Thursday with the letters "h" and "c" transposed in the word "school."

WOOO GRADUATED FROM ONTARIO HIGH SHCOOL !!!!!! pic.twitter.com/zZPzF7mSm3 — yaya (@jacedoooo_) May 20, 2016

School officials said the misspelling was a printing error made by the graduation products company.

"The principal has informed all Ontario graduates that the company has been contacted and will mail a corrected diploma cover to each graduate along with an apology letter," Chaffey Joint Union High School District Superintendent Mathew Holton said in a statement.

The diploma covers were distributed to about 550 seniors at a Thursday evening commencement ceremony, school officials said.

Holton added that the Ontario Class of 2016 was the first to graduate in a new stadium on campus with over 5,000 family members and friends in attendance.