The future of a historically important flint wall is under threat because a council wants to build a new entrance to a football club's ground.
The council said it is involving local people in the future of the wall
English Heritage said the wall "preserves the line of the precinct wall of Lewes Priory", but it also stands outside the home of Lewes FC.
Local historian Dr John Lawrence is campaigning to preserve the wall in the East Sussex town.
The council said it was continuing to seek an "acceptable solution".
The wall currently has a fence in front of it running along Ham Lane, which was put there by the council in case it fell down.
Building a new entrance to Lewes FC's ground could mean part of it having to be demolished.
Dr Lawrence said: "The flint wall at Lewes is almost unique in this country in the amount of flint [in it] and it's a very important part of the ambience of the town.
"It's just nibbling away at another bit of the historical beauty and importance of Lewes [and] one just wants to put a break to it."
The wall - which has been previously rebuilt - is mentioned in a book dating back to 1775 and English Heritage said it was a "nationally important monument".
The body has advised Lewes District Council that the flint wall cannot be replaced and that "localised repair and rebuilding would be least damaging to its historical interest".
The council ultimately has the final say and a meeting will discuss the wall on 11 January.