diff --git a/backup/moodle2/backup_geogebra_activity_task.class.php b/backup/moodle2/backup_geogebra_activity_task.class.php
index 72299d2..4860f5a 100644
--- a/backup/moodle2/backup_geogebra_activity_task.class.php
+++ b/backup/moodle2/backup_geogebra_activity_task.class.php
@@ -59,11 +59,11 @@ static public function encode_content_links($content) {
 
         // Link to the list of geogebras
         $search="/(".$base."\/mod\/geogebra\/index.php\?id\=)([0-9]+)/";
-        $content= preg_replace($search, '$@geogebraINDEX*$2@$', $content);
+        $content= preg_replace($search, '$@GEOGEBRAINDEX*$2@$', $content);
 
         // Link to geogebra view by moduleid
         $search="/(".$base."\/mod\/geogebra\/view.php\?id\=)([0-9]+)/";
-        $content= preg_replace($search, '$@geogebraVIEWBYID*$2@$', $content);
+        $content= preg_replace($search, '$@GEOGEBRAVIEWBYID*$2@$', $content);
 
         return $content;