A slave who drinks wine: how many lashes does he receive?

Yunus said that al-Hasan al-Basri said: When a slave confesses to drinking wine, his master is to give him forty lashes.

Al-Zuhri said: I was informed about Sayyiduna Umar, Sayyiduna Uthman and Sayyiduna Ibn Umar (may Allah be pleased with them) that all of them used to give a slave eighty lashes for drinking wine.