diff --git a/aiogram/dispatcher/fsm/state.py b/aiogram/dispatcher/fsm/state.py
index 5a4f4075..6c76913f 100644
--- a/aiogram/dispatcher/fsm/state.py
+++ b/aiogram/dispatcher/fsm/state.py
@@ -59,7 +59,7 @@ class State:
             return self.state == other.state
         if isinstance(other, str):
             return self.state == other
-        return False
+        return NotImplemented
 
     def __hash__(self) -> int:
         return hash(self.state)