At the eastern end of Rocher du Mauvais passage. Standing start on the small right face with a vertical crack right hand, traverse to the left as for Fête du Travail (retour) and traverse and exit to the right as for Fête du Travail.
From Route de Valmy, turn right onto Route du Champ de Manœuvre, after about 100m, turn right in the forest (no path) to climb towards a small hill. The boulder is located in the upper part of the ridge.