diff --git a/manifests/commands/definitions.pp b/manifests/commands/definitions.pp
index 01f5940..b4afdce 100644
--- a/manifests/commands/definitions.pp
+++ b/manifests/commands/definitions.pp
@@ -35,7 +35,7 @@ define cd_nrpe::commands::definitions (
 $ne_check_cmd     = undef,
 $ne_cmd_path      = '/usr/lib64/nagios/plugins/',
 $ne_cmd_argstring = undef,
-$ne_cmd_comment   = undef,
+$ne_cmd_comment   = '',
 
 ) {