diff --git a/Lib/Cookie.py b/Lib/Cookie.py
index 616377cf736..2eda48c0bb1 100644
--- a/Lib/Cookie.py
+++ b/Lib/Cookie.py
@@ -539,7 +539,7 @@ def OutputString(self, attrs=None):
     r"(?P<val>"                   # Start of group 'val'
     r'"(?:[^\\"]|\\.)*"'            # Any doublequoted string
     r"|"                            # or
-    r"\w{3},\s[\w\d-]{9,11}\s[\d:]{8}\sGMT" # Special case for "expires" attr
+    r"\w{3},\s[\s\w\d-]{9,11}\s[\d:]{8}\sGMT" # Special case for "expires" attr
     r"|"                            # or
     ""+ _LegalCharsPatt +"*"        # Any word or empty string
     r")"                          # End of group 'val'