diff -r 5873cfb42ebe Lib/http/cookies.py
--- a/Lib/http/cookies.py	Tue Feb 02 17:04:56 2016 -0600
+++ b/Lib/http/cookies.py	Sat Feb 06 22:59:06 2016 +0530
@@ -164,7 +164,7 @@
 #       _LegalChars       is the list of chars which don't require "'s
 #       _Translator       hash-table for fast quoting
 #
-_LegalChars = string.ascii_letters + string.digits + "!#$%&'*+-.^_`|~:"
+_LegalChars = string.ascii_letters + string.digits + "!#$%&'*+\-.^_`|~:"
 _UnescapedChars = _LegalChars + ' ()/<=>?@[]{}'
 
 _Translator = {n: '\\%03o' % n