diff --git a/common/php/screen-options.php b/common/php/screen-options.php
index 5bfdec0a1..6679806bd 100644
--- a/common/php/screen-options.php
+++ b/common/php/screen-options.php
@@ -166,7 +166,8 @@ function ajax_save_callback(){
 		}
 		
 		//The 'action' argument is in the form "save_settings-panel_id"
-		$id = end(explode('-', $_POST['action'], 2));
+		$ids = explode( '-', $_POST['action'], 2 );
+		$id = end( $ids );
 		
 		//Basic security check.
 		check_ajax_referer('save_settings-' . $id, '_wpnonce-' . $id);