diff --git a/packages/element-web-playwright-common/src/fixtures/axe.ts b/packages/element-web-playwright-common/src/fixtures/axe.ts
index 2c0c97af45..b7c03763cc 100644
--- a/packages/element-web-playwright-common/src/fixtures/axe.ts
+++ b/packages/element-web-playwright-common/src/fixtures/axe.ts
@@ -8,7 +8,7 @@ Please see LICENSE files in the repository root for full details.
 
 import AxeBuilder from "@axe-core/playwright";
 
-import { test as base } from "./user";
+import { test as base } from "./user.js";
 
 // We want to avoid using `mergeTests` because it drops useful type information about the fixtures. Instead, we extend
 // the definition of `test` from `user.ts`, so that there is a linear hierarchy.
diff --git a/packages/element-web-playwright-common/src/fixtures/index.ts b/packages/element-web-playwright-common/src/fixtures/index.ts
index 58aebfa20e..de7bce2f29 100644
--- a/packages/element-web-playwright-common/src/fixtures/index.ts
+++ b/packages/element-web-playwright-common/src/fixtures/index.ts
@@ -9,4 +9,4 @@ export { type Services, type WorkerOptions } from "./services.js";
 
 // We avoid using `mergeTests` because it drops useful type information about the fixtures.
 // `axe` is the top of our stack of extensions (it extends `user`, etc), so it's the one we want to use.
-export { test } from "./axe";
+export { test } from "./axe.js";
diff --git a/packages/element-web-playwright-common/src/testcontainers/HomeserverContainer.ts b/packages/element-web-playwright-common/src/testcontainers/HomeserverContainer.ts
index 57ceb653db..dcb5efa386 100644
--- a/packages/element-web-playwright-common/src/testcontainers/HomeserverContainer.ts
+++ b/packages/element-web-playwright-common/src/testcontainers/HomeserverContainer.ts
@@ -8,9 +8,9 @@ Please see LICENSE files in the repository root for full details.
 import { type AbstractStartedContainer, type GenericContainer } from "testcontainers";
 import { type APIRequestContext, type TestInfo } from "@playwright/test";
 
-import { type StartedMatrixAuthenticationServiceContainer } from "./mas";
-import { type ClientServerApi, type Credentials } from "../utils/api";
-import { type StartedMailpitContainer } from "./mailpit";
+import { type StartedMatrixAuthenticationServiceContainer } from "./mas.js";
+import { type ClientServerApi, type Credentials } from "../utils/api.js";
+import { type StartedMailpitContainer } from "./mailpit.js";
 
 export interface HomeserverInstance {
     readonly baseUrl: string;
diff --git a/packages/element-web-playwright-common/tsconfig.json b/packages/element-web-playwright-common/tsconfig.json
index 04bbd964f0..bbbd26cdb4 100644
--- a/packages/element-web-playwright-common/tsconfig.json
+++ b/packages/element-web-playwright-common/tsconfig.json
@@ -4,6 +4,8 @@
     "compilerOptions": {
         "outDir": "lib",
         "declarationMap": true,
+        "module": "node16",
+        "moduleResolution": "node16",
         "allowImportingTsExtensions": false
     },
     "include": ["src"]