diff --git a/MaibDescription.php b/MaibDescription.php
index 77d306a..e283fb9 100644
--- a/MaibDescription.php
+++ b/MaibDescription.php
@@ -210,7 +210,7 @@ public function __construct( array $options = [ ], $merchantHandler = '/ecomm2/M
 							'location' => 'postField',
 							'required' => true,
 						],
-						'amount '  => [
+						'amount'   => [
 							'type'     => 'string',
 							'location' => 'postField',
 							'required' => false,