diff --git a/Lib/bsddb/test/test_sequence.py b/Lib/bsddb/test/test_sequence.py
index f998df7..e630f1a 100644
--- a/Lib/bsddb/test/test_sequence.py
+++ b/Lib/bsddb/test/test_sequence.py
@@ -24,7 +24,7 @@
             pass
         tempfile.tempdir = self.homeDir
         self.filename = os.path.split(tempfile.mktemp())[1]
-        tempfile.tempdir = old_tempfile_tempdir
+        tempfile.tempdir = None
 
         self.dbenv = db.DBEnv()
         self.dbenv.open(self.homeDir, db.DB_CREATE | db.DB_INIT_MPOOL, 0o666)