diff --git a/aiogram/fsm/storage/mongo.py b/aiogram/fsm/storage/mongo.py
index ae10c82a..48061566 100644
--- a/aiogram/fsm/storage/mongo.py
+++ b/aiogram/fsm/storage/mongo.py
@@ -64,7 +64,7 @@ class MongoStorage(BaseStorage):
     def resolve_state(self, value: StateType) -> Optional[str]:
         if value is None:
             return None
-        elif isinstance(value, State):
+        if isinstance(value, State):
             return value.state
         return str(value)