diff -r 688701337b1a Lib/argparse.py
--- a/Lib/argparse.py	Sat Sep 06 17:24:35 2014 -0400
+++ b/Lib/argparse.py	Tue Sep 09 00:19:37 2014 +0800
@@ -468,7 +468,7 @@
         close = r'[\])]'
         text = _re.sub(r'(%s) ' % open, r'\1', text)
         text = _re.sub(r' (%s)' % close, r'\1', text)
-        text = _re.sub(r'%s *%s' % (open, close), r'', text)
+        text = _re.sub(r'%s *%s ?' % (open, close), r'', text)
         text = _re.sub(r'\(([^|]*)\)', r'\1', text)
         text = text.strip()
 
diff -r 688701337b1a Lib/test/test_argparse.py
--- a/Lib/test/test_argparse.py	Sat Sep 06 17:24:35 2014 -0400
+++ b/Lib/test/test_argparse.py	Tue Sep 09 00:19:37 2014 +0800
@@ -2315,6 +2315,17 @@
               '''
         self.assertEqual(parser.format_help(), textwrap.dedent(expected))
 
+    def test_wrapped_usage_suppressed_help(self):
+        parser = argparse.ArgumentParser()
+        group = parser.add_mutually_exclusive_group()
+        group.add_argument('--arg1', help=argparse.SUPPRESS)
+        parser.add_argument('--arg2')
+        parser.add_argument('--arg3')
+        parser.add_argument('--arg4')
+        parser.add_argument('--arg5')
+        parser.add_argument('--arg6')
+        parser.format_usage()
+
 class MEMixin(object):
 
     def test_failures_when_not_required(self):