diff --git a/mandayejs/mandaye/migrations/0001_initial.py b/mandayejs/mandaye/migrations/0001_initial.py
index 1b02b94..5ecb5dc 100644
--- a/mandayejs/mandaye/migrations/0001_initial.py
+++ b/mandayejs/mandaye/migrations/0001_initial.py
@@ -33,8 +33,8 @@ class Migration(migrations.Migration):
                 ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
                 ('username', models.CharField(max_length=50, verbose_name='Username')),
                 ('password', models.CharField(max_length=50, verbose_name='Password')),
-                ('site', models.ForeignKey(to='mandaye.Site')),
-                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL)),
+                ('site', models.ForeignKey(to='mandaye.Site', on_delete=models.CASCADE)),
+                ('user', models.ForeignKey(to=settings.AUTH_USER_MODEL, on_delete=models.CASCADE)),
             ],
             options={
             },
diff --git a/mandayejs/mandaye/models.py b/mandayejs/mandaye/models.py
index 37a30de..62c8251 100644
--- a/mandayejs/mandaye/models.py
+++ b/mandayejs/mandaye/models.py
@@ -30,7 +30,7 @@ from mandayejs.mandaye.utils import get_password_field
 
 
 class UserCredentials(models.Model):
-    user = models.ForeignKey('auth.User')
+    user = models.ForeignKey('auth.User', on_delete=models.CASCADE)
     locators = JSONField(_('locators'), default={}, blank=True)
     linked = models.BooleanField(_('associated'), default=False, blank=True)