diff --git a/tests/upgrade_test.php b/tests/upgrade_test.php
index a33eb16..deffd3f 100644
--- a/tests/upgrade_test.php
+++ b/tests/upgrade_test.php
@@ -30,6 +30,9 @@ public function test_upgrade_2024090900_completion_changes() {
         $course2_mod1 = $this->create_legacy_module($course2->id);
         $course_3_mod1 = $this->create_legacy_module($course3->id);
 
+        // mock global function upgrade_plugin_savepoint, required by upgrade.php/xmldb_local_adler_upgrade
+        function upgrade_plugin_savepoint($v1, $v2, $v3, $v4) {}
+
         // call cud
         xmldb_local_adler_upgrade(2024090800);