diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 247824b..395b7a3 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -853,7 +853,7 @@
                 startupinfo.dwFlags |= _subprocess.STARTF_USESHOWWINDOW
                 startupinfo.wShowWindow = _subprocess.SW_HIDE
                 comspec = os.environ.get("COMSPEC", "cmd.exe")
-                args = comspec + " /c " + '"%s"' % args
+                args = comspec + " /c " + args
                 if (_subprocess.GetVersion() >= 0x80000000L or
                         os.path.basename(comspec).lower() == "command.com"):
                     # Win9x, or using command.com on NT. We need to
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index ccb7a69..15ca1975 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -872,54 +872,12 @@
         self.assertEqual([(256, 999), (666,), (666,)], record_calls)
 
 
-@unittest.skipUnless(mswindows, "mswindows only")
-class CommandsWithSpaces (BaseTestCase):
-
-    def setUp(self):
-        super(CommandsWithSpaces, self).setUp()
-        f, fname = mkstemp(".py", "te st")
-        self.fname = fname.lower ()
-        os.write(f, b"import sys;"
-                    b"sys.stdout.write('%d %s' % (len(sys.argv), [a.lower () for a in sys.argv]))"
-        )
-        os.close(f)
-
-    def tearDown(self):
-        os.remove(self.fname)
-        super(CommandsWithSpaces, self).tearDown()
-
-    def with_spaces(self, *args, **kwargs):
-        kwargs['stdout'] = subprocess.PIPE
-        p = subprocess.Popen(*args, **kwargs)
-        self.assertEqual(
-          p.stdout.read ().decode("mbcs"),
-          "2 [%r, 'ab cd']" % self.fname
-        )
-
-    def test_shell_string_with_spaces(self):
-        # call() function with string argument with spaces on Windows
-        self.with_spaces('"%s" "%s"' % (self.fname, "ab cd"), shell=1)
-
-    def test_shell_sequence_with_spaces(self):
-        # call() function with sequence argument with spaces on Windows
-        self.with_spaces([self.fname, "ab cd"], shell=1)
-
-    def test_noshell_string_with_spaces(self):
-        # call() function with string argument with spaces on Windows
-        self.with_spaces('"%s" "%s" "%s"' % (sys.executable, self.fname,
-                             "ab cd"))
-
-    def test_noshell_sequence_with_spaces(self):
-        # call() function with sequence argument with spaces on Windows
-        self.with_spaces([sys.executable, self.fname, "ab cd"])
-
 def test_main():
     unit_tests = (ProcessTestCase,
                   POSIXProcessTestCase,
                   Win32ProcessTestCase,
                   ProcessTestCaseNoPoll,
-                  HelperFunctionTests,
-                  CommandsWithSpaces)
+                  HelperFunctionTests)
 
     test_support.run_unittest(*unit_tests)
     test_support.reap_children()