diff --git a/django_etebase/migrations/0037_auto_20210127_1237.py b/django_etebase/migrations/0037_auto_20210127_1237.py
new file mode 100644
index 0000000..06c31b2
--- /dev/null
+++ b/django_etebase/migrations/0037_auto_20210127_1237.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.1.1 on 2021-01-27 12:37
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('django_etebase', '0036_auto_20201214_1128'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='collectiontype',
+            name='uid',
+            field=models.BinaryField(db_index=True, editable=True, max_length=1024, unique=True),
+        ),
+    ]
diff --git a/django_etebase/models.py b/django_etebase/models.py
index fa56a95..4640e6d 100644
--- a/django_etebase/models.py
+++ b/django_etebase/models.py
@@ -36,7 +36,7 @@ def stoken_annotation_builder(stoken_id_fields: t.List[str]):
 
 class CollectionType(models.Model):
     owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
-    uid = models.BinaryField(editable=True, blank=False, null=False, db_index=True, unique=True)
+    uid = models.BinaryField(editable=True, blank=False, null=False, db_index=True, unique=True, max_length=1024)
 
     objects: models.manager.BaseManager["CollectionType"]