diff --git a/seminar/migrations/0050_auto_20190510_2228.py b/seminar/migrations/0050_auto_20190510_2228.py
index e0594be7..7efe52a7 100644
--- a/seminar/migrations/0050_auto_20190510_2228.py
+++ b/seminar/migrations/0050_auto_20190510_2228.py
@@ -164,7 +164,7 @@ class Migration(migrations.Migration):
             name='PohadkaNode',
             fields=[
                 ('treenode_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='seminar.TreeNode')),
-                ('pohadka', models.ForeignKey(null=True, on_delete=django.db.models.deletion.PROTECT, to='seminar.Pohadka', verbose_name='pohádka')),
+                ('pohadka', models.OneToOneField(on_delete=django.db.models.deletion.PROTECT, to='seminar.Pohadka', verbose_name='pohádka')),
             ],
             options={
                 'verbose_name': 'Pohádka (Node)',
diff --git a/seminar/models.py b/seminar/models.py
index a4c3211f..f867991a 100644
--- a/seminar/models.py
+++ b/seminar/models.py
@@ -1183,11 +1183,10 @@ class PohadkaNode(TreeNode):
 		db_table = 'seminar_nodes_pohadka'
 		verbose_name = 'Pohádka (Node)'
 		verbose_name_plural = 'Pohádky (Node)'
-	pohadka = models.ForeignKey(Pohadka,
-		on_delete=models.PROTECT, # Pokud chci mazat téma, musím si Node pořešit ručně
+	pohadka = models.OneToOneField(Pohadka,
+		on_delete=models.PROTECT, # Pokud chci mazat pohádku, musím si Node pořešit ručně
 		verbose_name = "pohádka",
-		null=True,
-		blank=False)
+		)
 
 class UlohaVzorakNode(TreeNode):
 	class Meta: