diff --git a/pep-3100.txt b/pep-3100.txt
index 662073705..f8b6a078a 100644
--- a/pep-3100.txt
+++ b/pep-3100.txt
@@ -183,7 +183,7 @@ To be removed:
 
 * ``apply()``: use ``f(*args, **kw)`` instead [2]_ [done]
 * ``buffer()``: must die (use a bytes() type instead) (?) [2]_ [done]
-* ``callable()``: just use hasattr(x, '__call__') (?) [2]_ [done]
+* ``callable()``: just use isinstance(x, collections.Callable) (?) [2]_ [done]
 * ``compile()``: put in ``sys`` (or perhaps in a module of its own) [2]_
 * ``coerce()``: no longer needed [2]_ [done]
 * ``execfile()``, ``reload()``: use ``exec()`` [2]_ [done]