Mark Stimson's Gillingham will play Luton on 1st April in a re-arranged League One clash at Priestfield.
The game had been due to be played on Tuesday, 12th February, but was postponed due to fog and will now take place on Tuesday, 1st April, with a 7.45pm kick-off.
Meanwhile, Hatters defender Ed Asafu-Adjaye is close to making a two-month extension to his current loan deal with Blue Square Premier side Salisbury.
Salisbury assistant manager Tommy Widdrington said: "He's knitted us together well with his pace across the back.
"We're delighted about how he has done here."