diff --git a/backend/functions/src/services/puppeteer.ts b/backend/functions/src/services/puppeteer.ts
index 59c02fa..b532b20 100644
--- a/backend/functions/src/services/puppeteer.ts
+++ b/backend/functions/src/services/puppeteer.ts
@@ -4,7 +4,7 @@ import { container, singleton } from 'tsyringe';
 import { AsyncService, Defer, marshalErrorLike, AssertionFailureError, delay, Deferred, perNextTick, ParamValidationError } from 'civkit';
 import { Logger } from '../shared/services/logger';
 
-import type { Browser, CookieParam, GoToOptions, HTTPResponse, Page } from 'puppeteer';
+import type { Browser, CookieParam, GoToOptions, HTTPResponse, Page, Viewport } from 'puppeteer';
 import type { Cookie } from 'set-cookie-parser';
 import puppeteer from 'puppeteer-extra';
 
@@ -555,6 +555,9 @@ export class PuppeteerControl extends AsyncService {
             }
             page.emit('snapshot', snapshot);
         }));
+        preparations.push(page.exposeFunction('setViewport', (viewport: Viewport | null) => {
+            page.setViewport(viewport).catch(() => undefined);
+        }));
         preparations.push(page.evaluateOnNewDocument(SCRIPT_TO_INJECT_INTO_FRAME));
         preparations.push(page.setRequestInterception(true));