diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index 9b4bdb9bd6..dded81da82 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -309,7 +309,7 @@ class FieldGetDbPrepValueIterableMixin(FieldGetDbPrepValueMixin):
         return sql, tuple(params)
 
 
-class PostgresOperatorLookup(FieldGetDbPrepValueMixin, Lookup):
+class PostgresOperatorLookup(Lookup):
     """Lookup defined by operators on PostgreSQL."""
 
     postgres_operator = None