Doctors at a clinic in Sweden are under investigation after reportedly performing a vasectomy on the wrong patient.

The man, who has not been identified, filed a complaint with the country’s National Board of Health and Welfare following the incident on June 22, the Swedish paper, The Local reported.

In the complaint, the man claims the staff at the urology and gynecology clinic did not double check his identity prior to the procedure and ultimately confused it with a vasectomy scheduled for the next day.

The man said he was only scheduled to have a biopsy on his prostate.

The health agency is now trying to determine if the clinic should face any sanctions, according to the newspaper.

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