The 19-year-old was loaned to the Blue Square Premier side for a month in November and has now agreed to a join them for the rest of the season.
Cobblers boss Ian Sampson told BBC Radio Northampton: "It's competitive, and there are a lot of good players in the Conference.
"He's not in my immediate plans but he's maybe got a future here."
Benjamin signed his first professional contract with Northampton in January 2009.
Source: BBC Sport
Source: BBC Sport