A hastily-rearrnaged game will see the Shrimpers' first team play host to Pinchbeck United on Saturday October 5, kick-off 3pm on the Royal Oak.
Matt Carmichael's side had been due to travel to Lincolnshire to face the Thurlow Nunn League newcomers that day.
However, the game has now been switched because Pinchbeck's landlords, Spalding United, have been drawn at home in the FA Trophy that day.
The clash will be the first-ever meeting of the two clubs.
The away game was been rescheduled for February 15.