Northampton Town captain Kelvin Langmead says there has been a "huge improvement" to their defence.
The Cobblers kept their fourth clean sheet of the league season in the 0-0 draw with Chesterfield. They kept just nine in the entire 2011-12 campaign.
Langmead told BBC Radio Northampton: "We're pleased with the clean sheet and to be unbeaten at home in the league.
"The defence needed to be improved from last year and [the clean sheets] show the huge improvement we've made."
The Cobblers lie ninth in League Two after three wins, three draws and two defeats.
They reached the second round of the Capital One Cup but were beaten by Wolves, and play Colchester in the second round of the Johnstone's Paint Trophy next month.
"We've had a really busy schedule so far," said Langmead. "We're in a decent bit of form so the games can't come soon enough."