Index: /mods/wpsg_mod_willcollect.class.php
===================================================================
--- /mods/wpsg_mod_willcollect.class.php	(revision 7415)
+++ /mods/wpsg_mod_willcollect.class.php	(revision 7416)
@@ -75,5 +75,5 @@
 			$this->shop->update_option('wpsg_mod_willcollect_payment_gebuehr', $_REQUEST['wpsg_mod_willcollect_payment_gebuehr'], false, false, "key", ["isFloat"]);
 
-			$this->shop->update_option('wpsg_mod_willcollect_mwst', $_REQUEST['wpsg_mod_willcollect_mwst'], false, false, "key");
+			$this->shop->update_option('wpsg_mod_willcollect_mwst', $_REQUEST['wpsg_mod_willcollect_mwst'], false, false, "wpsg_taxkey");
 			$this->shop->update_option('wpsg_mod_willcollect_mwstland', $_REQUEST['wpsg_mod_willcollect_mwstland'], false, false, "key");