diff --git a/mod/assign/locallib.php b/mod/assign/locallib.php
index 38d03f0daa6..e96aaedcf7e 100644
--- a/mod/assign/locallib.php
+++ b/mod/assign/locallib.php
@@ -1870,13 +1870,14 @@ class assign {
      * Mark in the database that this grade record should have an update notification sent by cron.
      *
      * @param stdClass $grade a grade record keyed on id
+     * @param bool $mailedoverride when true, flag notification to be sent again.
      * @return bool true for success
      */
-    public function notify_grade_modified($grade) {
+    public function notify_grade_modified($grade, $mailedoverride = false) {
         global $DB;
 
         $flags = $this->get_user_flags($grade->userid, true);
-        if ($flags->mailed != 1) {
+        if ($flags->mailed != 1 || $mailedoverride) {
             $flags->mailed = 0;
         }
 
@@ -6652,7 +6653,7 @@ class assign {
         // Note the default if not provided for this option is true (e.g. webservices).
         // This is for backwards compatibility.
         if (!isset($formdata->sendstudentnotifications) || $formdata->sendstudentnotifications) {
-            $this->notify_grade_modified($grade);
+            $this->notify_grade_modified($grade, true);
         }
     }
 
diff --git a/mod/assign/tests/locallib_test.php b/mod/assign/tests/locallib_test.php
index df4419bc0a7..19f3d7b1927 100644
--- a/mod/assign/tests/locallib_test.php
+++ b/mod/assign/tests/locallib_test.php
@@ -947,6 +947,13 @@ class mod_assign_locallib_testcase extends mod_assign_base_testcase {
         $this->assertEquals(2, count($messages));
         $this->assertEquals(1, $messages[0]->notification);
         $this->assertEquals($assign->get_instance()->name, $messages[0]->contexturlname);
+
+        // Regrading a grade causes a notification to the user.
+        $data->sendstudentnotifications = true;
+        $assign->testable_apply_grade_to_user($data, $this->students[0]->id, 0);
+        assign::cron();
+        $messages = $sink->get_messages();
+        $this->assertEquals(3, count($messages));
     }
 
     /**