diff --git a/attic/repository.py b/attic/repository.py
index bd10e3212..a926d7a78 100755
--- a/attic/repository.py
+++ b/attic/repository.py
@@ -478,7 +478,7 @@ class LoggedIO(object):
 
     def delete_segment(self, segment):
         fd = self.fds.pop(segment)
-        if fd != None:
+        if fd is not None:
             fd.close()
         try:
             os.unlink(self.segment_filename(segment))