diff --git a/install/calculate b/install/calculate
index cbe9c01..bd94c05 100755
--- a/install/calculate
+++ b/install/calculate
@@ -253,7 +253,7 @@ sub getarg{
 			"a" => '', "addition" => '',
 			"s" => '', "os" => '',
 			"d" => '', "disk" => '',
-			"S" => '', "scratch" => '',
+			"b" => '', "build" => '',
 			"f" => '', "force" => '',
 			"U" => '', "updateonly" => '',
 			"P" => '', "profile" => '',