diff --git a/kamailio/default.cfg b/kamailio/default.cfg
index 1af80db..ec71f21 100644
--- a/kamailio/default.cfg
+++ b/kamailio/default.cfg
@@ -113,7 +113,12 @@ loadmodule "path.so"
 loadmodule "ctl.so"
 modparam("ctl", "binrpc_buffer_size", 4096)
 loadmodule "cfg_rpc.so"
+
+######## Kamailio config utils module ########
 loadmodule "cfgutils.so"
+modparam("cfgutils", "lock_set_size", 4)
+
+######## Kamailio corex module ########
 loadmodule "corex.so"
 
 ######## Kamailio uuid module ########