diff --git a/netbox/dcim/models/mixins.py b/netbox/dcim/models/mixins.py
index 127dfb9e5..e9484264c 100644
--- a/netbox/dcim/models/mixins.py
+++ b/netbox/dcim/models/mixins.py
@@ -85,7 +85,7 @@ class CachedScopeMixin(models.Model):
         abstract = True
 
     def clean(self):
-        if self.scope_type and not self.scope:
+        if self.scope_type and not (self.scope or self.scope_id):
             scope_type = self.scope_type.model_class()
             raise ValidationError({
                 'scope': _(
diff --git a/netbox/ipam/tests/test_api.py b/netbox/ipam/tests/test_api.py
index 6255aaf86..a7562a53b 100644
--- a/netbox/ipam/tests/test_api.py
+++ b/netbox/ipam/tests/test_api.py
@@ -1,6 +1,7 @@
 import json
 import logging
 
+from django.test import tag
 from django.urls import reverse
 from netaddr import IPNetwork
 from rest_framework import status
@@ -383,6 +384,18 @@ class PrefixTest(APIViewTestCases.APIViewTestCase):
         )
         Prefix.objects.bulk_create(prefixes)
 
+    @tag('regression')
+    def test_clean_validates_scope(self):
+        prefix = Prefix.objects.first()
+        site = Site.objects.create(name='Test Site', slug='test-site')
+
+        data = {'scope_type': 'dcim.site', 'scope_id': site.id}
+        url = reverse('ipam-api:prefix-detail', kwargs={'pk': prefix.pk})
+        self.add_permissions('ipam.change_prefix')
+
+        response = self.client.patch(url, data, format='json', **self.header)
+        self.assertHttpStatus(response, status.HTTP_200_OK)
+
     def test_list_available_prefixes(self):
         """
         Test retrieval of all available prefixes within a parent prefix.