diff --git a/app/models/groups.py b/app/models/groups.py
index 7e330e62..688744b0 100644
--- a/app/models/groups.py
+++ b/app/models/groups.py
@@ -60,7 +60,6 @@ class GroupDescr(db.Model):
 
 group_membership = db.Table(
     "group_membership",
-    db.Column("id", db.Integer, primary_key=True),  # was group_membership_id
     db.Column("etudid", db.Integer, db.ForeignKey("identite.id")),
     db.Column("group_id", db.Integer, db.ForeignKey("group_descr.id")),
     db.UniqueConstraint("etudid", "group_id"),