diff --git a/manifests/init.pp b/manifests/init.pp
index 0ce8a96..cf7f755 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -57,7 +57,6 @@ define concat(
   $force          = false,
   $backup         = 'puppet',
   $replace        = true,
-  $gnu            = undef,
   $order          = 'alpha',
   $ensure_newline = false,
 ) {