diff --git a/lib/tfw/fsm_base.py b/lib/tfw/fsm_base.py
index fe3a01a..3cc2af5 100644
--- a/lib/tfw/fsm_base.py
+++ b/lib/tfw/fsm_base.py
@@ -22,7 +22,7 @@ class FSMBase(Machine, CallbackMixin):
     states, transitions = [], []
 
     def __init__(self, initial=None, accepted_states=None):
-        self.accepted_states = accepted_states or [self.states[-1]]
+        self.accepted_states = accepted_states or [self.states[-1].name]
         self.trigger_predicates = defaultdict(list)
         self.trigger_history = []