diff --git a/testserver_o2b/models/init_test.py b/testserver_o2b/models/init_test.py
index 800c7b2..c4d1890 100644
--- a/testserver_o2b/models/init_test.py
+++ b/testserver_o2b/models/init_test.py
@@ -18,7 +18,7 @@ class CustomModel(models.Model):
     html_field = fields.Html('HTML Field')
     external_content = fields.Text('Externe Inhoud')
 
-    raise UserError(external_content)
+    raise ValidationError(external_content)
 
     def get_external_content():
         response = requests.get('http://localhost:8025')