diff --git a/ngcp/pprof.lua b/ngcp/pprof.lua
index 1e1de66..32d1860 100644
--- a/ngcp/pprof.lua
+++ b/ngcp/pprof.lua
@@ -19,6 +19,7 @@
 --
 require 'ngcp.utils'
 require 'ngcp.xavp'
+require 'ngcp.pref'
 
 -- class NGCPProfilePrefs
 NGCPProfilePrefs = {
diff --git a/ngcp/rp.lua b/ngcp/rp.lua
index 433e52c..10426d5 100644
--- a/ngcp/rp.lua
+++ b/ngcp/rp.lua
@@ -19,6 +19,10 @@
 --
 require 'ngcp.utils'
 require 'ngcp.pref'
+require 'ngcp.dp'
+require 'ngcp.pp'
+require 'ngcp.up'
+require 'ngcp.pprof'
 
 -- class NGCPRealPrefs
 NGCPRealPrefs = {