diff --git a/manifests/params.pp b/manifests/params.pp
index ce0ce1b..7c02743 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -46,6 +46,7 @@ class prometheus_cd::params (
   $ps_main_dir            = '/etc/prometheus'
 
   # files
+  $ps_main_file           = "${ps_main_dir}/prometheus.yml"
 
   # services
   $ps_prom_service        = 'prometheus'