diff --git a/various/migrations/0001_initial.py b/various/migrations/0001_initial.py
index 1cc24c3d..38f2a029 100644
--- a/various/migrations/0001_initial.py
+++ b/various/migrations/0001_initial.py
@@ -4,13 +4,15 @@ from django.db import migrations, models
 
 def nastav_nove_contenttypes(apps, schema_editor):
     ContentType = apps.get_model('contenttypes', 'ContentType')
-    old_ct = ContentType.objects.get_by_natural_key('seminar', 'nastaveni')
-    old_ct.update(appname='various')
+    old_ct = ContentType.objects.filter(app_label='seminar', model='nastaveni')
+    # Pozn: tohle může být prázdné (pokud Django nedostalo signál o dokončených migracích, např. při vyrábění databáze z nuly)
+    # Ale .update to nevadí…
+    old_ct.update(app_label='various')
 
 def nastav_stare_contenttypes(apps, schema_editor):
     ContentType = apps.get_model('contenttypes', 'ContentType')
-    new_ct = ContentType.objects.get_by_natural_key('various', 'nastaveni')
-    new_ct.update(appname='seminar')
+    new_ct = ContentType.objects.filter(app_label='various', model='nastaveni')
+    new_ct.update(app_label='seminar')
 
 class Migration(migrations.Migration):