diff --git a/pex/common.py b/pex/common.py
index a0e06deb7..2b322cb85 100644
--- a/pex/common.py
+++ b/pex/common.py
@@ -78,7 +78,7 @@ def teardown(self):
 _MKDTEMP_SINGLETON = MktempTeardownRegistry()
 
 
-class PermPreservingZipFile(zipfile.ZipFile):
+class PermPreservingZipFile(zipfile.ZipFile, object):
   """A ZipFile that works around https://bugs.python.org/issue15795"""
 
   def _extract_member(self, member, targetpath, pwd):