diff --git a/enrol/database/tests/sync_test.php b/enrol/database/tests/sync_test.php
index 8a32b6a39ed..d70f41b5756 100644
--- a/enrol/database/tests/sync_test.php
+++ b/enrol/database/tests/sync_test.php
@@ -58,7 +58,11 @@ class enrol_database_testcase extends advanced_testcase {
                 set_config('dbsetupsql', "SET NAMES 'UTF-8'", 'enrol_database');
                 set_config('dbsybasequoting', '0', 'enrol_database');
                 if (!empty($CFG->dboptions['dbsocket'])) {
-                    set_config('dbtype', 'mysqli://'.rawurlencode($CFG->dbuser).':'.rawurlencode($CFG->dbpass).'@'.rawurlencode($CFG->dbhost).'/'.rawurlencode($CFG->dbname).'?socket='.rawurlencode($CFG->dboptions['dbsocket']), 'enrol_database');
+                    $dbsocket = $CFG->dboptions['dbsocket'];
+                    if ((strpos($dbsocket, '/') === false and strpos($dbsocket, '\\') === false)) {
+                        $dbsocket = ini_get('mysqli.default_socket');
+                    }
+                    set_config('dbtype', 'mysqli://'.rawurlencode($CFG->dbuser).':'.rawurlencode($CFG->dbpass).'@'.rawurlencode($CFG->dbhost).'/'.rawurlencode($CFG->dbname).'?socket='.rawurlencode($dbsocket), 'enrol_database');
                 }
                 break;