diff --git a/filter/algebra/algebradebug.php b/filter/algebra/algebradebug.php
index 2ee949ababd..24eb0310821 100644
--- a/filter/algebra/algebradebug.php
+++ b/filter/algebra/algebradebug.php
@@ -3,8 +3,6 @@
       // If not, it obtains the corresponding TeX expression from the cache_tex db table
       // and uses mimeTeX to create the image file
 
-    define('NO_MOODLE_COOKIES', true); // Because it interferes with caching
-
     require_once("../../config.php");
 
     if (!filter_is_enabled('algebra')) {