diff --git a/tempest/api/compute/limits/test_absolute_limits_negative.py b/tempest/api/compute/limits/test_absolute_limits_negative.py
index b917607..d537d83 100644
--- a/tempest/api/compute/limits/test_absolute_limits_negative.py
+++ b/tempest/api/compute/limits/test_absolute_limits_negative.py
@@ -14,12 +14,18 @@
 #    under the License.
 
 from tempest.api.compute import base
+from tempest.common import tempest_fixtures as fixtures
 from tempest import exceptions
 from tempest import test
 
 
 class AbsoluteLimitsNegativeTestJSON(base.BaseV2ComputeTest):
 
+    def setUp(self):
+        # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
+        self.useFixture(fixtures.LockFixture('compute_quotas'))
+        super(AbsoluteLimitsNegativeTestJSON, self).setUp()
+
     @classmethod
     def resource_setup(cls):
         super(AbsoluteLimitsNegativeTestJSON, cls).resource_setup()