diff --git a/static/app.js b/static/app.js
index b34782d..744d6f3 100644
--- a/static/app.js
+++ b/static/app.js
@@ -198,7 +198,7 @@ function renderButtons() {
 }
 
 function updateProgress(completedCount, totalChunks) {
-  const percentage = totalChunks === 0 ? 100 : (completedCount / totalChunks) * 100;
+  const percentage = totalChunks === 0 ? 0 : (completedCount / totalChunks) * 100;
   progressBar.style.width = `${percentage}%`;
   progressMeta.textContent = `${completedCount} of ${totalChunks} chunks`;
 }