diff --git a/woocommerce-basic-ordernumbers.php b/woocommerce-basic-ordernumbers.php
index 42704db02edac3fb5a2405a5a6bf8d2ff2461b36..afd6a640ff8427d7918537d7805ec3ac23c5f657 100644
--- a/woocommerce-basic-ordernumbers.php
+++ b/woocommerce-basic-ordernumbers.php
@@ -20,6 +20,9 @@ if ( ! defined( 'ABSPATH' ) ) {
  * Check if WooCommerce is active
  **/
 function oton_is_wc_active() {
+	if ( ! function_exists( 'is_plugin_active_for_network' ) ) {
+		require_once( ABSPATH . '/wp-admin/includes/plugin.php' );
+	}
 	return 
 		in_array( 'woocommerce/woocommerce.php', apply_filters( 'active_plugins', get_option( 'active_plugins' ) ) ) 
 		||