diff --git a/src/diffusers/configuration_utils.py b/src/diffusers/configuration_utils.py
index 7a95ce20aaff..b3f0e0ec2906 100644
--- a/src/diffusers/configuration_utils.py
+++ b/src/diffusers/configuration_utils.py
@@ -81,7 +81,7 @@ def __setattr__(self, name, value):
 
     def __setitem__(self, name, value):
         if hasattr(self, "__frozen") and self.__frozen:
-            raise Exception(f"You cannot use ``__setattr__`` on a {self.__class__.__name__} instance.")
+            raise Exception(f"You cannot use ``__setitem__`` on a {self.__class__.__name__} instance.")
         super().__setitem__(name, value)