diff --git a/nodeconductor/openstack/migrations/0003_instance.py b/nodeconductor/openstack/migrations/0003_instance.py
index <HASH>..<HASH> 100644
--- a/nodeconductor/openstack/migrations/0003_instance.py
+++ b/nodeconductor/openstack/migrations/0003_instance.py
@@ -11,6 +11,8 @@ import uuidfield.fields
 import django.core.validators
 import model_utils.fields
 
+import nodeconductor.core.validators
+
 
 class Migration(migrations.Migration):
Add import for validation (NC-<I>)