diff --git a/Lib/distutils/tests/test_upload.py b/Lib/distutils/tests/test_upload.py
index 8e8ff72..1fcba88 100644
--- a/Lib/distutils/tests/test_upload.py
+++ b/Lib/distutils/tests/test_upload.py
@@ -114,7 +114,8 @@
          # what did we send ?
         headers = dict(self.last_open.req.headers)
         self.assertEqual(headers['Content-length'], '2087')
-        self.assertTrue(headers['Content-type'].startswith('multipart/form-data'))
+        content_type = headers['Content-type']
+        self.assertTrue(content_type.startswith('multipart/form-data'))
         self.assertEqual(self.last_open.req.get_method(), 'POST')
         expected_url = 'https://pypi.python.org/pypi'
         self.assertEqual(self.last_open.req.get_full_url(), expected_url)