diff --git a/Lib/test/test_fileio.py b/Lib/test/test_fileio.py
index cb6ec8e..a63ba06 100644
--- a/Lib/test/test_fileio.py
+++ b/Lib/test/test_fileio.py
@@ -341,6 +341,7 @@
         f.truncate(15)
         self.assertEqual(f.tell(), 5)
         self.assertEqual(f.seek(0, os.SEEK_END), 15)
+        f.close()
 
     def testTruncateOnWindows(self):
         def bug801631():