diff --git a/public/js/assets.js b/public/js/assets.js
index 7992df36..824ab58e 100644
--- a/public/js/assets.js
+++ b/public/js/assets.js
@@ -417,6 +417,7 @@ export function loadImageElement(url) {
     if (typeof Image === 'undefined') { reject(new Error('no Image in this environment')); return; }
     const img = new Image();
     img.decoding = 'async';
+    img.crossOrigin = 'anonymous';
     img.onload = () => resolve(img);
     img.onerror = () => reject(new Error(`image failed: ${url}`));
     img.src = url;
diff --git a/public/js/ui/guide.js b/public/js/ui/guide.js
index eca03ba4..e1f3343d 100644
--- a/public/js/ui/guide.js
+++ b/public/js/ui/guide.js
@@ -67,6 +67,7 @@ function preload(url) {
   if (!url || typeof Image === 'undefined') return;
   const img = new Image();
   img.decoding = 'async';
+  img.crossOrigin = 'anonymous';
   img.src = url;
 }