diff --git a/Lib/ntpath.py b/Lib/ntpath.py
index cf3c0be10f7..fcb899bd8ff 100644
--- a/Lib/ntpath.py
+++ b/Lib/ntpath.py
@@ -22,7 +22,7 @@
 extsep = '.'
 sep = '\\'
 pathsep = ';'
-altsep = None
+altsep = '/'
 defpath = '.;C:\\bin'
 if 'ce' in sys.builtin_module_names:
     defpath = '\\Windows'