diff --git a/lib/tests/completionlib_test.php b/lib/tests/completionlib_test.php
index b0625f11821..d9a75de7af5 100644
--- a/lib/tests/completionlib_test.php
+++ b/lib/tests/completionlib_test.php
@@ -59,15 +59,7 @@ class core_completionlib_testcase extends advanced_testcase {
         // Create a course with activities.
         $this->course = $this->getDataGenerator()->create_course(array('enablecompletion' => true));
         $this->user = $this->getDataGenerator()->create_user();
-        $studentrole = $DB->get_record('role', array('shortname' => 'student'));
-        $this->assertNotEmpty($studentrole);
-
-        // Get manual enrolment plugin and enrol user.
-        require_once($CFG->dirroot.'/enrol/manual/locallib.php');
-        $manplugin = enrol_get_plugin('manual');
-        $maninstance = $DB->get_record('enrol', array('courseid' => $this->course->id, 'enrol' => 'manual'), '*', MUST_EXIST);
-        $manplugin->enrol_user($maninstance, $this->user->id, $studentrole->id);
-        $this->assertEquals(1, $DB->count_records('user_enrolments'));
+        $this->getDataGenerator()->enrol_user($this->user->id, $this->course->id);
 
         $this->module1 = $this->getDataGenerator()->create_module('forum', array('course' => $this->course->id));
         $this->module2 = $this->getDataGenerator()->create_module('forum', array('course' => $this->course->id));