Kieran Agard's first-half strike was enough for MK Dons as they secured their fourth win and fourth clean sheet in succession with a 1-0 victory over Northampton.
The Dons started on the front foot but it took until the stroke of half-time for the deadlock to be broken, Agard smashing home from Jordan Moore-Taylor's header after a corner.
But Northampton fought back after the break, Billy Waters holding the key to a number of visiting attacks.
The Cobblers then had goalkeeper David Cornell to thank for a wonderful save to deny Joe Walsh while a goal-saving challenge from Jordan Turnbull kept the score at 1-0 just moments later.
Agard thought he had his second, only to be called back for a foul, while Northampton substitute Daniel Powell was thwarted by Lee Nicholls after being played in by Kevin van Veen.
Rhys Healey then smashed the crossbar for the hosts with a volley before Chuks Aneke headed over, though the solitary Agard goal proved enough despite two dangerous crosses late on from Van Veen.