diff --git a/tempest/api/compute/test_quotas.py b/tempest/api/compute/test_quotas.py
index dc85e76..eeff3ce 100644
--- a/tempest/api/compute/test_quotas.py
+++ b/tempest/api/compute/test_quotas.py
@@ -14,11 +14,17 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest.common import tempest_fixtures as fixtures
 from tempest import test
 
 
 class QuotasTestJSON(base.BaseV2ComputeTest):
 
+    def setUp(self):
+        # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
+        self.useFixture(fixtures.LockFixture('compute_quotas'))
+        super(QuotasTestJSON, self).setUp()
+
     @classmethod
     def setUpClass(cls):
         super(QuotasTestJSON, cls).setUpClass()