--- a/Lib/test/test_io.py	Tue Mar 01 10:26:10 2016 +0200
+++ b/Lib/test/test_io.py	Wed Mar 02 00:01:35 2016 +0000
@@ -411,17 +411,17 @@ class IOTest(unittest.TestCase):
         self.assertEqual(data, b"hello world\n")
         f = self.BytesIO(data)
         self.read_ops(f, True)
 
     def test_large_file_ops(self):
         # On Windows and Mac OSX this test comsumes large resources; It takes
         # a long time to build the >2GB file and takes >2GB of disk space
         # therefore the resource must be enabled to run this test.
-        if sys.platform[:3] == 'win' or sys.platform == 'darwin':
+        if sys.platform[:3] == 'win' or sys.platform in ('darwin', 'ios'):
             support.requires(
                 'largefile',
                 'test requires %s bytes and a long time to run' % self.LARGE)
         with self.open(support.TESTFN, "w+b", 0) as f:
             self.large_file_ops(f)
         with self.open(support.TESTFN, "w+b") as f:
             self.large_file_ops(f)