diff --git a/src/Ui/UiRequest.py b/src/Ui/UiRequest.py
index 32b1af7f..a8fdf00f 100644
--- a/src/Ui/UiRequest.py
+++ b/src/Ui/UiRequest.py
@@ -183,7 +183,7 @@ class UiRequest(object):
 
     # Redirect to an url
     def actionRedirect(self, url):
-        self.start_response('301 Redirect', [('Location', url)])
+        self.start_response('301 Redirect', [('Location', str(url))])
         yield "Location changed: %s" % url
 
     def actionIndex(self):