diff --git a/playwright/e2e/crypto/backups-mas.spec.ts b/playwright/e2e/crypto/backups-mas.spec.ts
index 1838f9e234..b51f737255 100644
--- a/playwright/e2e/crypto/backups-mas.spec.ts
+++ b/playwright/e2e/crypto/backups-mas.spec.ts
@@ -67,8 +67,7 @@ test.describe("Key backup reset from elsewhere", () => {
         await page.getByRole("textbox", { name: "Name" }).fill("test room");
         await page.getByRole("button", { name: "Create room" }).click();
 
-        // @ts-ignore - this runs in the browser scope where mxMatrixClientPeg is a thing. Here, it is not.
-        const accessToken = await page.evaluate(() => mxMatrixClientPeg.get().getAccessToken());
+        const accessToken = await page.evaluate(() => window.mxMatrixClientPeg.get().getAccessToken());
 
         const csAPI = new TestClientServerAPI(request, homeserver, accessToken);
 
diff --git a/playwright/e2e/csAPI.ts b/playwright/e2e/csAPI.ts
index 78362506ef..f171ded5e3 100644
--- a/playwright/e2e/csAPI.ts
+++ b/playwright/e2e/csAPI.ts
@@ -21,7 +21,7 @@ export class TestClientServerAPI extends ClientServerApi {
         homeserver: HomeserverInstance,
         private accessToken: string,
     ) {
-        super(`${homeserver.baseUrl}/_matrix/client`);
+        super(homeserver.baseUrl);
         this.setRequest(request);
     }