diff --git a/PVE/API2/Nodes.pm b/PVE/API2/Nodes.pm
index 715c8563..ddeafbef 100644
--- a/PVE/API2/Nodes.pm
+++ b/PVE/API2/Nodes.pm
@@ -48,6 +48,7 @@ use Digest::MD5;
 use Digest::SHA;
 use PVE::API2::Disks;
 use PVE::DataCenterConfig;
+use PVE::RRD;
 use JSON;
 use Socket;
 
@@ -593,7 +594,7 @@ __PACKAGE__->register_method({
     code => sub {
 	my ($param) = @_;
 
-	return PVE::Cluster::create_rrd_graph(
+	return PVE::RRD::create_rrd_graph(
 	    "pve2-node/$param->{node}", $param->{timeframe},
 	    $param->{ds}, $param->{cf});
 
@@ -635,7 +636,7 @@ __PACKAGE__->register_method({
     code => sub {
 	my ($param) = @_;
 
-	return PVE::Cluster::create_rrd_data(
+	return PVE::RRD::create_rrd_data(
 	    "pve2-node/$param->{node}", $param->{timeframe}, $param->{cf});
     }});