diff --git a/apps/assets/models/asset.py b/apps/assets/models/asset.py
index a5e578760..4aaa0287d 100644
--- a/apps/assets/models/asset.py
+++ b/apps/assets/models/asset.py
@@ -49,7 +49,7 @@ class Asset(models.Model):
     ip = models.GenericIPAddressField(max_length=32, verbose_name=_('IP'), db_index=True)
     hostname = models.CharField(max_length=128, unique=True, verbose_name=_('Hostname'))
     port = models.IntegerField(default=22, verbose_name=_('Port'))
-    domain = models.ForeignKey("assets.Domain", null=True, blank=True, related_name='assets', verbose_name=_("Domain"))
+    domain = models.ForeignKey("assets.Domain", null=True, blank=True, related_name='assets', verbose_name=_("Domain"), on_delete=models.SET_NULL)
     nodes = models.ManyToManyField('assets.Node', default=default_node, related_name='assets', verbose_name=_("Nodes"))
     is_active = models.BooleanField(default=True, verbose_name=_('Is active'))