diff --git a/etc/inc/functions.inc b/etc/inc/functions.inc
index f35e960316..678f08c1ad 100644
--- a/etc/inc/functions.inc
+++ b/etc/inc/functions.inc
@@ -88,5 +88,6 @@ require_once("vslb.inc");
 require_once("gwlb.inc");
 require_once("notices.inc");
 require_once("cmd_chain.inc");
+require_once("rrd.inc");
 
 ?>