DERBY, Kan. (AP) — A Kansas man shot himself in the head with a nail gun as he fell off a ladder, but was able to walk to the site of a traffic accident to ask law enforcement for help.

Sedgwick County Sheriff’s Lt. Tim Myers says the man is in critical condition after the accident Wednesday morning in Derby, about 10 miles (16 kilometers) south of Wichita.

The Wichita Eagle reports that Myers said the man told sheriff’s deputies and a Derby police officer that he was renovating a house when he slipped off a ladder with the nail gun in his hands. When he landed, the nail gun hit him in the back of the head and the man “inadvertently pulled the trigger with his finger.”

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