diff --git a/lighthouse-core/audits/screenshot-thumbnails.js b/lighthouse-core/audits/screenshot-thumbnails.js
index 93b18dc81610..0511dcea4ed9 100644
--- a/lighthouse-core/audits/screenshot-thumbnails.js
+++ b/lighthouse-core/audits/screenshot-thumbnails.js
@@ -32,7 +32,7 @@ class ScreenshotThumbnails extends Audit {
    * Scales down an image to THUMBNAIL_WIDTH using nearest neighbor for speed, maintains aspect
    * ratio of the original thumbnail.
    *
-   * @param {{width: number, height: number, data: Buffer}} imageData
+   * @param {ReturnType<SpeedlineFrame['getParsedImage']>} imageData
    * @return {{width: number, height: number, data: Uint8Array}}
    */
   static scaleImageToThumbnail(imageData) {