diff --git a/src/common/Page.ts b/src/common/Page.ts
index d1ca8bb931a09..21f85c7d06235 100644
--- a/src/common/Page.ts
+++ b/src/common/Page.ts
@@ -2610,7 +2610,7 @@ export class Page extends EventEmitter {
 
     if (options.quality) {
       assert(
-        screenshotType === 'jpeg',
+        screenshotType === 'jpeg' || screenshotType === 'webp',
         'options.quality is unsupported for the ' +
           screenshotType +
           ' screenshots'