diff --git a/course/externallib.php b/course/externallib.php
index e48f039ff7a..5476db1bd03 100644
--- a/course/externallib.php
+++ b/course/externallib.php
@@ -4263,7 +4263,7 @@ class core_course_external extends external_api {
 
         self::validate_context($usercontext);
 
-        if ($userid != $USER->id and !has_capability('moodle/user:viewdetails', $usercontext)) {
+        if ($userid != $USER->id && !has_capability('moodle/user:viewalldetails', $usercontext)) {
             return array();
         }