diff --git a/lib/grade/grade_item.php b/lib/grade/grade_item.php
index 56cf6bcdba4..a8690f6ae34 100644
--- a/lib/grade/grade_item.php
+++ b/lib/grade/grade_item.php
@@ -1815,6 +1815,7 @@ class grade_item extends grade_object {
 
         // update in db if changed
         if (grade_floats_different($grade->finalgrade, $oldfinalgrade)) {
+            $grade->timemodified = time();
             $grade->update('compute');
         }