diff --git a/lib/moodlelib.php b/lib/moodlelib.php
index 4f543ea91af..4866aaee982 100644
--- a/lib/moodlelib.php
+++ b/lib/moodlelib.php
@@ -6322,7 +6322,8 @@ function email_to_user($user, $from, $subject, $messagetext, $messagehtml = '',
                 $CFG->dataroot,
                 $CFG->dirroot,
                 $CFG->localcachedir,
-                $CFG->tempdir
+                $CFG->tempdir,
+                $CFG->localrequestdir,
             ]);
             // Set addpath to true.
             $addpath = true;
diff --git a/lib/tests/moodlelib_test.php b/lib/tests/moodlelib_test.php
index ff52d2c1e18..69621008bfd 100644
--- a/lib/tests/moodlelib_test.php
+++ b/lib/tests/moodlelib_test.php
@@ -3446,6 +3446,9 @@ class core_moodlelib_testcase extends advanced_testcase {
             'dirroot' => [$CFG->dirroot],
             'localcachedir' => [$CFG->localcachedir],
             'tempdir' => [$CFG->tempdir],
+            // Paths within $CFG->localrequestdir.
+            'localrequestdir_request_directory' => [make_request_directory()],
+            'localrequestdir_request_storage_directory' => [get_request_storage_directory()],
             // Pass null to indicate we want to test a path relative to $CFG->dataroot.
             'relative' => [null]
         ];