diff --git a/lib/sqlalchemy/orm/strategy_options.py b/lib/sqlalchemy/orm/strategy_options.py
index 13c5100475..1963e5843d 100644
--- a/lib/sqlalchemy/orm/strategy_options.py
+++ b/lib/sqlalchemy/orm/strategy_options.py
@@ -449,6 +449,7 @@ def __setstate__(self, state):
                 if len(key) == 2:
                     # support legacy
                     cls, propkey = key
+                    of_type = None
                 else:
                     cls, propkey, of_type = key
                 prop = getattr(cls, propkey)