diff --git a/zproject/settings.py b/zproject/settings.py
index 85bb1a6f29..0a371d3b05 100644
--- a/zproject/settings.py
+++ b/zproject/settings.py
@@ -271,6 +271,7 @@ DEFAULT_SETTINGS = {'TWITTER_CONSUMER_KEY': '',
                     'ENABLE_GRAVATAR': True,
                     'DEFAULT_AVATAR_URI': '/static/images/default-avatar.png',
                     'AUTH_LDAP_SERVER_URI': "",
+                    'EXTERNAL_URI_SCHEME': "https://",
                     }
 
 for setting_name, setting_val in DEFAULT_SETTINGS.iteritems():