diff --git a/neutron_tempest_plugin/api/admin/test_quotas.py b/neutron_tempest_plugin/api/admin/test_quotas.py
index 0cf474e..eb47fa5 100644
--- a/neutron_tempest_plugin/api/admin/test_quotas.py
+++ b/neutron_tempest_plugin/api/admin/test_quotas.py
@@ -87,7 +87,7 @@
         new_quotas = {'network': 0, 'security_group': 0}
 
         # Change quotas for tenant
-        quota_set = self._setup_quotas(tenant_id, **new_quotas)
+        quota_set = self._setup_quotas(tenant_id, force=True, **new_quotas)
         for key, value in new_quotas.items():
             self.assertEqual(value, quota_set[key])
 
@@ -112,6 +112,23 @@
         for q in non_default_quotas['quotas']:
             self.assertNotEqual(tenant_id, q['tenant_id'])
 
+    @decorators.idempotent_id('43d01327-d8be-4773-a8f0-1d2e9664fda2')
+    @decorators.attr(type='gate')
+    @utils.requires_ext(extension='quota-check-limit-default',
+                        service='network')
+    def test_quotas_force_false(self):
+        project_id = self.create_project()['id']
+        self._create_network(project_id)
+
+        new_quotas = {'network': 0}
+        # force=false (by default)
+        self.assertRaises(lib_exc.BadRequest, self.admin_client.update_quotas,
+                          project_id, **new_quotas)
+
+        new_quotas['network'] = 100
+        quota_set = self._setup_quotas(project_id, **new_quotas)
+        self.assertEqual(new_quotas['network'], quota_set['network'])
+
     @decorators.idempotent_id('e974b5ba-090a-452c-a578-f9710151d9fc')
     @decorators.attr(type='gate')
     @utils.requires_ext(extension="quota_details", service="network")
diff --git a/neutron_tempest_plugin/api/test_security_groups.py b/neutron_tempest_plugin/api/test_security_groups.py
index 5e8b18e..6992399 100644
--- a/neutron_tempest_plugin/api/test_security_groups.py
+++ b/neutron_tempest_plugin/api/test_security_groups.py
@@ -281,9 +281,10 @@
     def _set_quota(self, val, resource):
         res_quota = self._get_quota(resource)
         project_id = self.client.project_id
-        self.admin_client.update_quotas(project_id, **{resource: val})
+        self.admin_client.update_quotas(project_id, **{resource: val,
+                                                       'force': True})
         self.addCleanup(self.admin_client.update_quotas,
-                        project_id, **{resource: res_quota})
+                        project_id, **{resource: res_quota, 'force': True})
 
     def _get_quota(self, resource):
         project_id = self.client.project_id
@@ -383,7 +384,8 @@
     def _set_sg_rules_quota(self, val):
         project_id = self.client.project_id
         self.admin_client.update_quotas(project_id,
-                                        **{'security_group_rule': val})
+                                        **{'security_group_rule': val,
+                                           'force': True})
         LOG.info('Trying to update security group rule quota {} '.format(val))
 
     def _get_sg_rules_quota(self):
@@ -435,7 +437,8 @@
         sg_rules_quota = self._get_sg_rules_quota()
         project_id = self.client.project_id
         self.addCleanup(self.admin_client.update_quotas,
-                        project_id, **{'security_group_rule': sg_rules_quota})
+                        project_id, **{'security_group_rule': sg_rules_quota,
+                                       'force': True})
         values = [-1, 0, 10, 2147483647]
         for value in values:
             self._set_sg_rules_quota(value)