diff --git a/tools/tool-testing/selftest.js b/tools/tool-testing/selftest.js
index 3a3324d05f..baadd2ccfa 100644
--- a/tools/tool-testing/selftest.js
+++ b/tools/tool-testing/selftest.js
@@ -30,7 +30,7 @@ import { PackageMap } from '../packaging/package-map.js';
 import { current as releaseCurrent } from '../packaging/release.js';
 
 import { FinishedUpgraders } from '../project-context.js';
-var upgraders = require('../upgraders.js');
+import { allUpgraders } from '../upgraders.js';
 
 require("../tool-env/install-runtime.js");
 
@@ -707,7 +707,7 @@ export class Sandbox {
     var upgradersFile =
       new FinishedUpgraders({projectDir: absoluteTo});
     if (_.isEmpty(upgradersFile.readUpgraders())) {
-      upgradersFile.appendUpgraders(upgraders.allUpgraders());
+      upgradersFile.appendUpgraders(allUpgraders());
     }
 
     require("../cli/default-npm-deps.js").install(absoluteTo);