diff --git a/Lib/test/test_urllib.py b/Lib/test/test_urllib.py
index f41fa2a..82f1d9d 100644
--- a/Lib/test/test_urllib.py
+++ b/Lib/test/test_urllib.py
@@ -1527,6 +1527,24 @@ def test_quoting(self):
                          (expect, result))
 
     @unittest.skipUnless(sys.platform == 'win32',
+                         'test specific to the nturl2path functions.')
+    def test_prefixes(self):
+        # Test special prefixes are correctly handled in pathname2url()
+        given = '\\\\?\\C:\\dir'
+        expect = '///C:/dir'
+        result = urllib.request.pathname2url(given)
+        self.assertEqual(expect, result,
+                         "pathname2url() failed; %s != %s" %
+                         (expect, result))
+        given = '\\\\?\\unc\\server\\share\\dir'
+        expect = '/server/share/dir'
+        result = urllib.request.pathname2url(given)
+        self.assertEqual(expect, result,
+                         "pathname2url() failed; %s != %s" %
+                         (expect, result))
+
+
+    @unittest.skipUnless(sys.platform == 'win32',
                          'test specific to the urllib.url2path function.')
     def test_ntpath(self):
         given = ('/C:/', '///C:/', '/C|//')