diff --git a/pep-0654.rst b/pep-0654.rst
index ce26443f235..63e076a63d6 100644
--- a/pep-0654.rst
+++ b/pep-0654.rst
@@ -463,7 +463,7 @@ recursively, as follows:
             tbs = []
 
         tbs.append(exc.__traceback__)
-        if isinstance(exc, ExceptionGroup):
+        if isinstance(exc, BaseExceptionGroup):
             for e in exc.exceptions:
                 yield from leaf_generator(e, tbs)
         else: