diff --git a/libs/sdk-py/langgraph_sdk/auth/__init__.py b/libs/sdk-py/langgraph_sdk/auth/__init__.py
index e2ab57416..8b3e21779 100644
--- a/libs/sdk-py/langgraph_sdk/auth/__init__.py
+++ b/libs/sdk-py/langgraph_sdk/auth/__init__.py
@@ -510,7 +510,7 @@ class _StoreOn:
         """
         if fn is not None:
             # Used as a plain decorator
-            _register_handler(self._auth, None, None, fn)
+            _register_handler(self._auth, "store", None, fn)
             return fn
 
         # Used with parameters, return a decorator