The 2006 edition included 27 cobbled sections, including the renovated Arenberg trench.
Next season, those who brave the Queen of Classics will face an added sector, the Chemin du Moulin, between the towns of Orchies and Beuvry-la-forêt.
The 1400 metre-long stretch will include 800 metres of cobblestones and 600 metres of a non-tarmac road.
O'Grady best in velodrome
The cobbles, which are currently in poor condition, will be restored by a group of local youths.
The Chemin du Moulin will come at the 200-km mark of the 259-km long race.
Zabel withdraws with injury
Michaelsen to retire