diff --git a/src/back/image-router.ts b/src/back/image-router.ts
index ef6cea3..2946449 100644
--- a/src/back/image-router.ts
+++ b/src/back/image-router.ts
@@ -12,7 +12,7 @@ export const RESPONSIVE_IMAGES_URL_PATH = "/images";
 export const imageRouter = new KoaResponsiveImageRouter({
 	staticPath: RESPONSIVE_IMAGES_URL_PATH,
 	thumbnailSize: 20,
-	cacheManagerResolutionThreshold: 50,
+	cacheManagerResolutionThreshold: 21,
 	imageStoragePath: IMAGE_CACHE_FS_DIR,
 	smartCropStoragePath: SMARTCROP_CACHE_FS_DIR,
 	formatsForLossy: ["webp"],