A Brooklyn historian says Keap Street has been misspelled for about 150 years.

The apparently incorrect spelling is plastered on street signs for over a mile in Williamsburg.

Ron Schweiger, the Brooklyn borough historian, says the street was named after Thomas McKean, who cemented himself in United States history as one of the signers of the Declaration of Independence.

Schweiger says McKean himself is to blame for the mistake with his signature.

"Because of his poor penmanship, it was read as K-E-A-P instead of K-E-A-N," he says.

The City Council would have to vote to rename the street to correct it.