diff --git a/manifests/init.pp b/manifests/init.pp
index 981a5c2..83eb191 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -1,123 +1,124 @@
 # == Define: concat
 #
 # Sets up so that you can use fragments to build a final config file,
 #
 # === Options:
 #
 # [*ensure*]
 #   Present/Absent
 # [*path*]
 #   The path to the final file. Use this in case you want to differentiate
 #   between the name of a resource and the file path.  Note: Use the name you
 #   provided in the target of your fragments.
 # [*owner*]
 #   Who will own the file
 # [*group*]
 #   Who will own the file
 # [*mode*]
 #   The mode of the final file
 # [*warn_header*]
 #   Adds a normal shell style comment top of the file indicating that it is
 #   built by puppet
 # [*backup*]
 #   Controls the filebucketing behavior of the final file and see File type
 #   reference for its use.  Defaults to 'puppet'
 # [*replace*]
 #   Whether to replace a file that already exists on the local system
 # [*order*]
 #   Select whether to order associated fragments by 'alpha' or 'numeric'.
 #   Defaults to 'alpha'.
 #
 # === Actions:
 # * Creates a file_concat resource from the electrical/puppet-lib-file_concat library.
 # * Creates file_fragment resources from electrical/puppet-lib-file_concat
 #
 # === Aliases:
 #
 # * The exec can notified using Exec["concat_/path/to/file"] or
 #   Exec["concat_/path/to/directory"]
 # * The final file can be referenced as File["/path/to/file"] or
 #   File["concat_/path/to/file"]
 #
 
 define concat(
   $ensure         = 'present',
   $path           = $name,
   $owner          = undef,
   $group          = undef,
   $mode           = '0644',
   $warn           = false,
   $force          = undef,
   $backup         = 'puppet',
   $replace        = true,
   $order          = 'alpha',
   $validate_cmd   = undef,
 ) {
   validate_re($ensure, '^present$|^absent$')
   validate_absolute_path($path)
   validate_string($owner)
   validate_string($group)
   validate_string($mode)
   if ! (is_string($warn) or $warn == true or $warn == false) {
     fail('$warn is not a string or boolean')
   }
   if ! is_bool($backup) and ! is_string($backup) {
     fail('$backup must be string or bool!')
   }
   validate_bool($replace)
   validate_re($order, '^alpha$|^numeric$')
   if $validate_cmd and ! is_string($validate_cmd) {
     fail('$validate_cmd must be a string')
   }
 
   if $force != undef {
     warning('The $force parameter to concat is deprecated and has no effect.')
   }
 
   $safe_name            = regsubst($name, '[/:\n\s]', '_', 'G')
   $default_warn_message = "# This file is managed by Puppet. DO NOT EDIT.\n"
 
   case $warn {
     true: {
       $warn_message = $default_warn_message
-      $append_header = true
+      $_append_header = true
     }
     false: {
       $warn_message = ''
+      $_append_header = false
     }
     default: {
       $warn_message = $warn
-      $append_header = true
+      $_append_header = true
     }
   }
 
   if $ensure == 'present' {
     file_concat { $name:
       tag          => $safe_name,
       path         => $path,
       owner        => $owner,
       group        => $group,
       mode         => $mode,
       replace      => $replace,
       backup       => $backup,
       order        => $order,
       validate_cmd => $validate_cmd,
     }
 
-    if $append_header {
+    if $_append_header {
       file_fragment { "#{$name}_header":
         tag     => $safe_name,
         content => $warn_message,
         order   => '0',
       }
     }
   } else {
     file_concat { $name:
       ensure => $ensure,
       tag    => $safe_name,
       path   => $path,
       backup => $backup,
     }
   }
 }