diff --git a/development.ini b/development.ini
--- a/development.ini
+++ b/development.ini
@@ -280,12 +280,6 @@ issue_prefix = #
 #issue_server_link_wiki = https://wiki.example.com/{id}
 #issue_prefix_wiki = WIKI-
 
-## instance-id prefix
-## a prefix key for this instance used for cache invalidation when running
-## multiple instances of kallithea, make sure it's globally unique for
-## all running kallithea instances. Leave empty if you don't use it
-instance_id =
-
 ## alternative return HTTP header for failed authentication. Default HTTP
 ## response is 401 HTTPUnauthorized. Currently Mercurial clients have trouble with
 ## handling that. Set this variable to 403 to return HTTPForbidden