diff --git a/Lib/test/test_sysconfig.py b/Lib/test/test_sysconfig.py
index 92193602f98..c44e19276ff 100644
--- a/Lib/test/test_sysconfig.py
+++ b/Lib/test/test_sysconfig.py
@@ -305,14 +305,13 @@ class TestSysConfig(unittest.TestCase):
         if 'MACOSX_DEPLOYMENT_TARGET' in env:
             del env['MACOSX_DEPLOYMENT_TARGET']
 
-        with open('/dev/null', 'w') as devnull_fp:
-            p = subprocess.Popen([
-                    sys.executable, '-c',
-                    'import sysconfig; print(sysconfig.get_platform())',
-                ],
-                stdout=subprocess.PIPE,
-                stderr=devnull_fp,
-                env=env)
+        p = subprocess.Popen([
+                sys.executable, '-c',
+                'import sysconfig; print(sysconfig.get_platform())',
+            ],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.DEVNULL,
+            env=env)
         test_platform = p.communicate()[0].strip()
         test_platform = test_platform.decode('utf-8')
         status = p.wait()
@@ -325,20 +324,19 @@ class TestSysConfig(unittest.TestCase):
         env = os.environ.copy()
         env['MACOSX_DEPLOYMENT_TARGET'] = '10.1'
 
-        with open('/dev/null') as dev_null:
-            p = subprocess.Popen([
-                    sys.executable, '-c',
-                    'import sysconfig; print(sysconfig.get_platform())',
-                ],
-                stdout=subprocess.PIPE,
-                stderr=dev_null,
-                env=env)
-            test_platform = p.communicate()[0].strip()
-            test_platform = test_platform.decode('utf-8')
-            status = p.wait()
+        p = subprocess.Popen([
+                sys.executable, '-c',
+                'import sysconfig; print(sysconfig.get_platform())',
+            ],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.DEVNULL,
+            env=env)
+        test_platform = p.communicate()[0].strip()
+        test_platform = test_platform.decode('utf-8')
+        status = p.wait()
 
-            self.assertEqual(status, 0)
-            self.assertEqual(my_platform, test_platform)
+        self.assertEqual(status, 0)
+        self.assertEqual(my_platform, test_platform)
 
     def test_srcdir(self):
         # See Issues #15322, #15364.