fix

diff --git a/lib/sqlalchemy/testing/plugin/plugin_base.py b/lib/sqlalchemy/testing/plugin/plugin_base.py
index 55fbf8f11902a8ff2799d08cd70d89b39e399b24..e9e52827b36929e14c471a09fc0b199afc48d827 100644 (file)
--- a/lib/sqlalchemy/testing/plugin/plugin_base.py
+++ b/lib/sqlalchemy/testing/plugin/plugin_base.py
@@ -429,7 +429,7 @@ def _do_skips(cls):
         )
     elif hasattr(cls, '__prefer_backends__'):
         non_preferred = set()
-        spec = exclusions.db_spec(*util.to_list(cls.__prefer__))
+        spec = exclusions.db_spec(*util.to_list(cls.__prefer_backends__))
         for config_obj in all_configs:
             if not spec(config_obj):
                 non_preferred.add(config_obj)