diff --git a/CHANGES.rst b/CHANGES.rst
index 6d6e0dda5..4bd766da0 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -10,6 +10,14 @@ CHANGES
   not explicitly set in the environment.
   Fixes `#135 <https://github.com/pantsbuild/pex/issues/135>`_.
 
+* Bug fix: Since `69649c1 <https://github.com/pantsbuild/pex/commit/69649c1>`_ we have been unpatching
+  the side-effects of ``sys.modules`` after ``PEX.execute``.  This takes all modules imported during
+  the PEX lifecycle and sets all their attributes to ``None``.  Unfortunately, ``sys.excepthook``,
+  ``atexit`` and ``__del__`` may still try to operate using these tainted modules, causing exceptions
+  on interpreter teardown.  This reverts just the ``sys`` unpatching so that the abovementioned
+  teardown hooks behave more predictably.
+  Fixes `#141 <https://github.com/pantsbuild/pex/issues/141>`_.
+
 -----
 1.0.1
 -----
diff --git a/pex/pex.py b/pex/pex.py
index b9e86021b..2744bb61d 100644
--- a/pex/pex.py
+++ b/pex/pex.py
@@ -243,11 +243,7 @@ def patch_all(path, path_importer_cache, modules):
     new_sys_path, new_sys_path_importer_cache, new_sys_modules = cls.minimum_sys()
 
     patch_all(new_sys_path, new_sys_path_importer_cache, new_sys_modules)
-
-    try:
-      yield
-    finally:
-      patch_all(old_sys_path, old_sys_path_importer_cache, old_sys_modules)
+    yield
 
   def _wrap_coverage(self, runner, *args):
     if not self._vars.PEX_COVERAGE and self._vars.PEX_COVERAGE_FILENAME is None:
diff --git a/pex/version.py b/pex/version.py
index 342aff87f..46818e3b4 100644
--- a/pex/version.py
+++ b/pex/version.py
@@ -1,7 +1,7 @@
 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
 # Licensed under the Apache License, Version 2.0 (see LICENSE).
 
-__version__ = '1.0.1'
+__version__ = '1.0.2.dev0'
 
 SETUPTOOLS_REQUIREMENT = 'setuptools>=2.2,<16'
 WHEEL_REQUIREMENT = 'wheel>=0.24.0,<0.25.0'