diff --git a/includes/discovery/os/ibm-amm.inc.php b/includes/discovery/os/ibm-amm.inc.php
index 4611d3d9a9..6909fe59c4 100644
--- a/includes/discovery/os/ibm-amm.inc.php
+++ b/includes/discovery/os/ibm-amm.inc.php
@@ -1,5 +1,17 @@
 <?php
+/*
+ * LibreNMS IBM NOS information module
+ *
+ * Copyright (c) 2015 Søren Friis Rosiak <sorenrosiak@gmail.com>
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.  Please see LICENSE.txt at the top level of
+ * the source code distribution for details.
+ */
 
-if (stristr($sysDescr, 'BladeCenter Advanced Management Module')) {
-    $os = 'ibm-amm';
+if (!$os) {
+    if (stristr($sysDescr, 'BladeCenter Advanced Management Module')) {
+        $os = 'ibm-amm';
+    }
 }