diff --git a/includes/admin/class-wc-admin.php b/includes/admin/class-wc-admin.php
index 7dda1226cfc..95b1d4db7dc 100644
--- a/includes/admin/class-wc-admin.php
+++ b/includes/admin/class-wc-admin.php
@@ -204,7 +204,7 @@ class WC_Admin {
 	public function preview_emails() {
 
 		if ( isset( $_GET['preview_woocommerce_mail'] ) ) {
-			if ( ! ( isset( $_REQUEST['_wpnonce'] ) && wp_verify_nonce( sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'], 'preview-mail' ) ) ) ) ) {
+			if ( ! ( isset( $_REQUEST['_wpnonce'] ) && wp_verify_nonce( sanitize_text_field( wp_unslash( $_REQUEST['_wpnonce'] ) ), 'preview-mail' ) ) ) {
 				die( 'Security check' );
 			}