MK Dons made it nine wins in a row with a narrow victory over Hereford.
Mark Wright's rising shot in the 87th proved enough, with Hereford down to 10 men after Steve Guinan had been sent off in the first half.
But the Dons had goalkeeper Willy Gueret to thank for making two excellent saves in the opening stages.
Gueret stopped a shot from teenager Theo Robinson on the six-yard line and then threw himself across the goalmouth keep out a header from John McCombe.