diff --git a/src/config/cfg_rules.ini b/src/config/cfg_rules.ini
index 0fa06d586ab..836b74bd8c9 100644
--- a/src/config/cfg_rules.ini
+++ b/src/config/cfg_rules.ini
@@ -98,6 +98,7 @@ option = memcache_timeout
 option = memcache_size_passwd
 option = memcache_size_group
 option = memcache_size_initgroups
+option = memcache_size_sid
 
 [rule/allowed_pam_options]
 validator = ini_allowed_options