diff --git a/manifests/server/service.pp b/manifests/server/service.pp
index 74d7430..c893b6c 100644
--- a/manifests/server/service.pp
+++ b/manifests/server/service.pp
@@ -50,7 +50,7 @@ class cd_nagios::server::service (
       owner               =>  $ng_user,
       group               =>  $ng_user,
       mode                =>  '0640',
-      check_command       =>  "${check_ping}!${ng_ping_warn}!${ng_ping_crit}",
+      check_command       =>  "check_ping!${ng_ping_warn}!${ng_ping_crit}",
       notify              =>  Service[$ng_service],
   }