diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index 0d1ac87..37c4e0f 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -345,6 +345,9 @@
                          stdin=subprocess.PIPE,
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
+        self.addCleanup(p.stdout.close)
+        self.addCleanup(p.stderr.close)
+        self.addCleanup(p.stdin.close)
         (stdout, stderr) = p.communicate("banana")
         self.assertEqual(stdout, "banana")
         self.assertStderrEqual(stderr, "pineapple")
@@ -393,6 +396,9 @@
                          stdin=subprocess.PIPE,
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
+        self.addCleanup(p.stdout.close)
+        self.addCleanup(p.stderr.close)
+        self.addCleanup(p.stdin.close)
         string_to_write = "abc"*pipe_buf
         (stdout, stderr) = p.communicate(string_to_write)
         self.assertEqual(stdout, string_to_write)
@@ -405,6 +411,9 @@
                          stdin=subprocess.PIPE,
                          stdout=subprocess.PIPE,
                          stderr=subprocess.PIPE)
+        self.addCleanup(p.stdout.close)
+        self.addCleanup(p.stderr.close)
+        self.addCleanup(p.stdin.close)
         p.stdin.write("banana")
         (stdout, stderr) = p.communicate("split")
         self.assertEqual(stdout, "bananasplit")
@@ -454,6 +463,8 @@
                           'sys.stdout.write("\\nline6");'],
                          stdout=subprocess.PIPE, stderr=subprocess.PIPE,
                          universal_newlines=1)
+        self.addCleanup(p.stdout.close)
+        self.addCleanup(p.stderr.close)
         (stdout, stderr) = p.communicate()
         if hasattr(file, 'newlines'):
             # Interpreter with universal newline support
@@ -820,6 +831,7 @@
         p = subprocess.Popen(["set"], shell=1,
                              stdout=subprocess.PIPE,
                              env=newenv)
+        self.addCleanup(p.stdout.close)
         self.assertIn("physalis", p.stdout.read())
 
     def test_shell_string(self):
@@ -829,6 +841,7 @@
         p = subprocess.Popen("set", shell=1,
                              stdout=subprocess.PIPE,
                              env=newenv)
+        self.addCleanup(p.stdout.close)
         self.assertIn("physalis", p.stdout.read())
 
     def test_call_string(self):
@@ -848,6 +861,9 @@
                              stdin=subprocess.PIPE,
                              stdout=subprocess.PIPE,
                              stderr=subprocess.PIPE)
+        self.addCleanup(p.stdout.close)
+        self.addCleanup(p.stderr.close)
+        self.addCleanup(p.stdin.close)
         # Wait for the interpreter to be completely initialized before
         # sending any signal.
         p.stdout.read(1)
@@ -917,6 +933,7 @@
     def with_spaces(self, *args, **kwargs):
         kwargs['stdout'] = subprocess.PIPE
         p = subprocess.Popen(*args, **kwargs)
+        self.addCleanup(p.stdout.close)
         self.assertEqual(
           p.stdout.read ().decode("mbcs"),
           "2 [%r, 'ab cd']" % self.fname