diff --git a/netlify-example/brush/index.html b/netlify-example/brush/index.html
index 6b91b4420..d2245be3d 100644
--- a/netlify-example/brush/index.html
+++ b/netlify-example/brush/index.html
@@ -539,7 +539,7 @@ <h2>
   // Active Fill
   const alphaSlider = document.getElementById('fill-alpha');
 
-  alphaSlider.defaultValue = Math.floor(configuration.fillAlpha * 255);
+  alphaSlider.defaultValue = Math.floor(segmentationModule.configuration.fillAlpha * 255);
   alphaSlider.addEventListener('input', event => {
     const normalisedAlpha = event.target.value / 255.0;