diff --git a/_static/demos/circuits_as_fourier_series/sketch.js b/_static/demos/circuits_as_fourier_series/sketch.js
index bf2b69f1d8..d019008577 100644
--- a/_static/demos/circuits_as_fourier_series/sketch.js
+++ b/_static/demos/circuits_as_fourier_series/sketch.js
@@ -1,10 +1,10 @@
-var url_prefix = '/_static/demos/circuits_as_fourier_series/src/';
+var url_prefix = '../../_static/demos/circuits_as_fourier_series/src/';
 
-// fetch(url_prefix + 'fourier0-1.png', {method: 'HEAD'}).then(res => {
-//     if (!res.ok) {
-//         url_prefix = '../_static/demos/circuits_as_fourier_series/src/';
-//     }
-// });
+ fetch(url_prefix + 'fourier0-1.png', {method: 'HEAD'}).then(res => {
+     if (!res.ok) {
+         url_prefix = '../_static/demos/circuits_as_fourier_series/src/';
+     }
+ });
 
 
 ///// Sketch 0