diff --git a/python/nav/web/seeddb/page/prefix.py b/python/nav/web/seeddb/page/prefix.py
index a3c19834e5..5b4926feb4 100644
--- a/python/nav/web/seeddb/page/prefix.py
+++ b/python/nav/web/seeddb/page/prefix.py
@@ -31,6 +31,7 @@
 from nav.bulkparse import PrefixBulkParser
 from nav.bulkimport import PrefixImporter
 
+from nav.web.crispyforms import set_flat_form_attributes
 from nav.web.seeddb import SeeddbInfo
 from nav.web.seeddb.constants import SEEDDB_EDITABLE_MODELS
 from nav.web.seeddb.page import view_switcher, not_implemented
@@ -83,6 +84,8 @@ class Meta(object):
             'net_type',
         )
 
+    attrs = set_flat_form_attributes()
+
 
 def get_prefix_view(request):
     """Select appropriate view based on request POST data"""
diff --git a/python/nav/web/templates/seeddb/edit_prefix.html b/python/nav/web/templates/seeddb/edit_prefix.html
index 71b5882232..34e22cb12b 100644
--- a/python/nav/web/templates/seeddb/edit_prefix.html
+++ b/python/nav/web/templates/seeddb/edit_prefix.html
@@ -2,5 +2,9 @@
 {% load crispy_forms_tags %}
 {% block crispyfields %}
 {{ block.super }}
-{{ vlan_form|crispy }}
+{% if vlan_form.attrs %}
+    {% include 'custom_crispy_templates/_form_content.html' with form=vlan_form %}
+{% else %}
+    {{ vlan_form }}
+{% endif %}
 {% endblock %}