diff --git a/extern/acng b/extern/acng
index fb63fa4..e128c06 100644
--- a/extern/acng
+++ b/extern/acng
@@ -127,6 +127,7 @@ sub print_config{
 
     print << 'EOC';
 multigraph acng_bytes
+echo "graph_category acng"
 graph_title Apt-Cacher NG bytes
 graph_order origin client
 graph_vlabel bytes per ${graph_period}
@@ -148,6 +149,7 @@ EOV
     print << 'EOC';
 
 multigraph acng_requests
+echo "graph_category acng"
 graph_title Apt-Cacher NG requests
 graph_order origin client
 graph_vlabel requests per ${graph_period}