diff --git a/OpenSSL/test/util.py b/OpenSSL/test/util.py
index 78b4a3f..4b044b7 100644
--- a/OpenSSL/test/util.py
+++ b/OpenSSL/test/util.py
@@ -7,7 +7,6 @@
 U{Twisted<http://twistedmatrix.com/>}.
 """
 
-import os
 import shutil
 import sys
 import traceback
@@ -24,7 +23,8 @@
 try:
     import memdbg
 except Exception:
-    class _memdbg(object): heap = None
+    class _memdbg(object):
+        heap = None
     memdbg = _memdbg()
 
 from OpenSSL._util import ffi, lib, byte_string as b