diff --git a/lib/index.js b/lib/index.js
index ffefe07..cda4553 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -112,7 +112,7 @@ async function getDiscography(artistOrLabelUrl, options = {}) {
     const opts = {
         imageBaseUrl: imageConstants.baseUrl,
         artistOrLabelUrl,
-        imageFormat: await _parseImageFormatArg(options.imageFormat)
+        imageFormat: await _parseImageFormatArg(options.imageFormat, 9)
     };
     return fetch(utils.getUrl('music', artistOrLabelUrl))
         .then( res => res.text() )