diff --git a/seminar/migrations/0052_user_to_organizator.py b/seminar/migrations/0052_user_to_organizator.py
index 8d689a8c..ee844d1d 100644
--- a/seminar/migrations/0052_user_to_organizator.py
+++ b/seminar/migrations/0052_user_to_organizator.py
@@ -57,8 +57,8 @@ def spoj_k_organizatorum_osoby(apps, scema_editor):
 				osoba.jmeno = user.first_name
 				osoba.prijmeni = user.last_name
 				osoba.email = user.email
-				user.jmeno += " (Uživatel!)"
-				user.prijmeni += " (Uživatel!)"
+				user.first_name += " (Uživatel!)"
+				user.last_name += " (Uživatel!)"
 				osoba.datum_registrace = min(osoba.datum_registrace, user.date_joined, key=lambda d: d if d is not None else date.max)
 				user.save()