diff --git a/neutron/services/qos/constants.py b/neutron/services/qos/constants.py
index 576c3f54412..2f3afea6c0b 100644
--- a/neutron/services/qos/constants.py
+++ b/neutron/services/qos/constants.py
@@ -19,4 +19,12 @@ from neutron_lib.services.qos import constants as qos_consts
 # to neutron-lib after neutron has the new rule.
 # Add qos rule packet rate limit
 RULE_TYPE_PACKET_RATE_LIMIT = 'packet_rate_limit'
-VALID_RULE_TYPES = qos_consts.VALID_RULE_TYPES + [RULE_TYPE_PACKET_RATE_LIMIT]
+# NOTE(przszc): Ensure that there are no duplicates in the list. Order of the
+# items in the list must be stable, as QosRuleType OVO hash value depends on
+# it.
+# TODO(przszc): When a rule type is moved to neutron-lib, it can be removed
+# from the list below.
+VALID_RULE_TYPES = (qos_consts.VALID_RULE_TYPES +
+    ([RULE_TYPE_PACKET_RATE_LIMIT] if RULE_TYPE_PACKET_RATE_LIMIT not in
+        qos_consts.VALID_RULE_TYPES else [])
+)