diff --git a/packages/backend/src/services/drive/generate-video-thumbnail.ts b/packages/backend/src/services/drive/generate-video-thumbnail.ts
index ca12ab8d3..b3fd025ab 100644
--- a/packages/backend/src/services/drive/generate-video-thumbnail.ts
+++ b/packages/backend/src/services/drive/generate-video-thumbnail.ts
@@ -24,7 +24,7 @@ export async function GenerateVideoThumbnail(source: string): Promise<IImage> {
 		});
 
 		// JPEGに変換 (Webpでもいいが、MastodonはWebpをサポートせず表示できなくなる)
-		return await convertToJpeg(498, 280);
+		return await convertToJpeg(file, 498, 280);
 	} finally {
 		cleanup();
 	}