diff --git a/scripts/cros_sdk.py b/scripts/cros_sdk.py
index c0618e9..ad6ea46 100644
--- a/scripts/cros_sdk.py
+++ b/scripts/cros_sdk.py
@@ -9,6 +9,7 @@
 import glob
 import os
 import pwd
+import re
 import sys
 import urlparse
 
@@ -85,6 +86,7 @@
   # pylint: disable=C0301,W0631
   # https://sourceforge.net/tracker/?func=detail&atid=100976&aid=3482927&group_id=976
   logging.notice('Downloading chroot files.')
+  status_re = re.compile(r'^HTTP/[0-9].[0-9] 200')
   for url in urls:
     # http://www.logilab.org/ticket/8766
     # pylint: disable=E1101
@@ -101,9 +103,9 @@
         redirect_stderr=True, print_cmd=False, debug_level=logging.NOTICE)
     successful = False
     for header in result.output.splitlines():
-      # We must walk the output to find the string '200 OK' for use cases where
+      # We must walk the output to find the 200 code for use cases where
       # a proxy is involved and may have pushed down the actual header.
-      if header.find('200 OK') != -1:
+      if status_re.match(header):
         successful = True
       elif header.lower().startswith('content-length:'):
         content_length = int(header.split(':', 1)[-1].strip())