diff --git a/eleventy.config.js b/eleventy.config.js
index f05c8e3..8db6560 100644
--- a/eleventy.config.js
+++ b/eleventy.config.js
@@ -29,7 +29,10 @@ const urlFormat = ({ src, width, format }) => {
   const imgUuid = src.match(/\/([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})/);
   const imgFormat = format === 'jpeg' ? 'jpg' : format;
 
-  return `${baseUrl}/${imgUuid[1]}.${imgFormat}?width=${width}`;
+  if (src.startsWith(baseUrl))
+    return `${baseUrl}/${imgUuid[1]}.${imgFormat}?width=${width}`;
+
+  return src;
 };
 
 const MARKDOWNIT_OPTIONS = { html: true, linkify: true, typographer: true };