diff --git a/packages/backend/test/services/blocking.ts b/packages/backend/test/services/blocking.ts
index 9f78b331b..64fb6c152 100644
--- a/packages/backend/test/services/blocking.ts
+++ b/packages/backend/test/services/blocking.ts
@@ -4,7 +4,7 @@ import * as assert from 'assert';
 import * as childProcess from 'child_process';
 import { describe, before, beforeEach, after, it } from 'mocha';
 import * as sinon from 'sinon';
-import { async, signup, startServer, shutdownServer, initTestDb } from '../utils';
+import { async, signup, startServer, shutdownServer, initTestDb } from '../utils.js';
 
 describe('Creating a block activity', () => {
 	let p: childProcess.ChildProcess;