diff --git a/bin/merge-users b/bin/merge-users
index 650827b778c1a51eb392c75289106299313df11b..62b7eaaa550873067315eced84e616155aa23752 100755
--- a/bin/merge-users
+++ b/bin/merge-users
@@ -61,6 +61,8 @@ conn.execute(db.PointsHistory.__table__.update().where(db.PointsHistory.points_b
 
 conn.execute(db.Solution.__table__.update().where(db.Solution.user_id == suid).values(user_id=duid))
 
+conn.execute(db.Certificate.__table__.update().where(db.Certificate.user_id == suid).values(user_id=duid))
+
 conn.execute(db.Job.__table__.update().where(db.Job.user_id == suid).values(user_id=duid))
 
 conn.execute(db.User.__table__.delete().where(db.User.user_id == suid))