diff --git a/mandaye/filters/default.py b/mandaye/filters/default.py
index 9caf646..250e99d 100644
--- a/mandaye/filters/default.py
+++ b/mandaye/filters/default.py
@@ -38,7 +38,7 @@ class MandayeFilter(object):
         # Modify headers
         if response.headers.has_key('location'):
             response.headers.addheader('location',
-                    re.sub(r'http(s*)://%s' % env["target"].hostname,
+                    re.sub(r'^http(s*)://%s' % env["target"].hostname,
                         r"%s://%s" % (env["mandaye.scheme"], env["HTTP_HOST"]),
                         response.headers.getheader('location'),
                         flags=re.IGNORECASE)
@@ -131,4 +131,3 @@ class MandayeFilter(object):
         """
         if request.msg and not isinstance(request.msg, basestring):
             request.msg = request.msg.read()
-