diff --git a/woocommerce-advanced-ordernumbers.php b/woocommerce-advanced-ordernumbers.php
index 3144f29167275ae0f949086a5e5dc93da7c9a9d7..14219bd34ebf2dd98e593d774298d225572d3152 100644
--- a/woocommerce-advanced-ordernumbers.php
+++ b/woocommerce-advanced-ordernumbers.php
@@ -31,6 +31,8 @@ if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', g
 
 	if (!class_exists("OpenToolsOrdernumbers")) {
 		class OpenToolsOrdernumbers {
+			public $ordernumber_meta = "Order Number";
+			
 			/**
 			 * Construct the plugin object
 			 */
@@ -277,7 +279,7 @@ if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', g
 					$this->_setCounter($type, $counterfmt, $count);
 					// return the format with the counter inserted
 					$number = str_replace ("#", sprintf('%0' . $padding . 's', $count), $format);
-					update_post_meta( $orderid, 'Order Number', $number );
+					update_post_meta( $orderid, $this->ordernumber_meta, $number );
 					return $number;
 				} else {
 					return $orderid;
@@ -288,7 +290,7 @@ if ( in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', g
 			 * The hook to customize order numbers (requests the order number from the database; creates a new ordernumber if no entry exists in the database)
 			 */
 			function get_ordernumber($orderid, $order) {
-				$stored_number = get_post_meta( $orderid, 'Order Number', 'true');
+				$stored_number = get_post_meta( $orderid, $this->ordernumber_meta, 'true');
 				if (!empty($stored_number)) {
 					return $stored_number;
 				} elseif (get_option('customize_ordernumber', 'false')) {