diff --git a/libs/langgraph/langgraph/types.py b/libs/langgraph/langgraph/types.py
index 605f06f60..1ed6e43ad 100644
--- a/libs/langgraph/langgraph/types.py
+++ b/libs/langgraph/langgraph/types.py
@@ -238,7 +238,7 @@ class Control(Generic[N]):
         self.trigger = trigger
         self.send = send
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         contents = ", ".join(
             f"{key}={value!r}" for key, value in self.__dict__.items() if value
         )